Usage:
The 9S2000 Portable Hydraulic Flow Meter Group is a lightweight, compact unit capable of accurately measuring hydraulic oil flow, oil temperature, engine speed and operating pressure of the hydraulic system.
Components
1) FLOW BLOCK
2) CONTROL UNIT
3) 5P7360 TACHOMETER GENERATOR (FORMERLY 9S3047)
4) 9S3048 CABLE ASSEMBLY
5) 2P5523 CABLE ASSEMBLY
6) SAFETY DISC - 9S6341 - 4300 PSI (29 550 kPa), .010" (0.25) thick 1P7411 - 6200 PSI (42 880 kPa), .030" (0.34) thick
7) COVER ASSEMBLY
Specifications
Tachometer Generator Installation
The tachometer is calibrated to read engine speed from a half speed engine tachometer drive. Engine tachometer drive connections are of several types on Caterpillar machines. One is a tachometer drive output turning one-half engine speed. The 5P3760 (formerly 9S3047) Tachometer Generator Assembly (4) will fit directly to these connections. The remaining types are without a tachometer drive. See the Tee Test Tooling Chart to determine which tachometer drive provides a one-half engine speed connection for the 5P3760 (formerly 9S3047) Tachometer Generator Assembly. The 9S3048 Cable Assembly (5) connects the tachometer generator to the tachometer input on the flow meter.
Function Of Controls
The electronic circuits are controlled by two push-pull type "ON-OFF" switches. Switch (7) marked "G.P.M.", controls the circuits for the flow meter and thermistor thermometer. Switch (8) marked "R.P.M.", controls the circuit for the tachometer. Voltage adjust potentiometers (9) are used on both circuits to provide constant voltage to the circuits even though battery voltage may change due to temperature or use.
IMPORTANT: Always adjust, calibrate, and use the flow meter in a horizontal position.
Selector switches (10) and (11) control the functions of the two meters. Switch (10) has four positions, and controls the following functions: "V.ADJ." - voltage adjust for upper meter, "A" - 0 to 30 gallons per minute flow meter scale, "B" - 0 to 150 gallons per minute flow meter scale, and "F" - 32 to 300°F. temperature scale. Switch (11) has three positions and controls the following functions: "V.ADJ." -voltage adjust for lower meter, "A" - 0 to 2500 RPM tachometer scale, and "B" - 0 to 500 RPM tachometer scale.
Valve (1) is a manually controlled, pilot operated flow restrictor valve which allows close regulation of test pressures. Turn the control handle clockwise to increase pressure and counterclockwise to decrease pressure.
Pressure gauge (12) is a rugged, highly accurate unit, well snubbed to reduce needle pulsations, and is capable of withstanding over-pressure well above the safety disc rupture pressure of 6200 PSI.
Installing Flow Meter In Hydraulic Circuits
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Fully open load valve (1) by turning control handle counterclockwise before starting any flow through flow meter. Injury to personnel and damage to machine can result from excessive pressure developed if load valve is fully closed. Safety discs, designed to rupture at approximately 4300 PSI (300 kg/cm2) or 6200 PSI (440 kg/cm2), will relieve excessive pressure or pressure surges in the hydraulic system. |
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The flow meter can be installed in any location in a hydraulic circuit. The inlet connection to the flow meter is marked "IN" and the outlet connection is marked "OUT" on the flow meter block.
NOTE: If possible, avoid connecting the "IN" port within 18" (457) of valves, etc. These may cause disturbances which affect the accuracy of flow measurement.
"In-Line" Circuit
An "in-line" or series connection of flow meter into a hydraulic system measures flow and pressure in one portion of the system without affecting system performance. "In-line" connections are normally used for measuring continuous flow such as pump output or flow rates in transmission circuits.
"Tee-Test" Circuit
A "tee-test" or parallel circuit connection between the pump and the control valve allows troubleshooting of the complete hydraulic system from this one connection. The "tee-test" method is very useful for checking multiple circuit systems such as the implement hydraulic system of a Wheel Loader or Traxcavator.
NOTE: When using the flow meter in a parallel "tee-test" circuit, be sure the return line to the hydraulic tank extends below tank oil level. This reduces foaming of oil in the tank.
Installing Batteries
To install or replace mercury batteries (6), remove four screws from the battery holder panel and pull the battery holder from the case. Install the batteries so positive (+) and negative (-) ends of the battery are aligned with the same markings on the battery holder.
NOTE: Be sure that all the batteries are centered in the holder and in contact with the terminals. Reinstall the battery holder with the external grasping tab upwards.
Meter Zero Adjust
Before any test is started with the 9S2000 Flowmeter, make sure the panel meter pointers are on zero. Switches (7) and (8) must be in the "OFF" position and the meter faces in a horizontal position. If adjustment is necessary, turn the screw under the meter window to correct the pointer position. With a small screwdriver, turn the screw slowly clockwise or counterclockwise until the pointer is on zero.
Calibration Check With A Pulse Generator
The control unit can be checked for accuracy with a pulse generator using the TS-4 Calibrator available from Flo-Tech, Inc. The calibrator generates a known number of pulses per second which can be applied to the meter circuits. Make a calibration check of the control unit any time one of the panel meters is changed and any time one of the four printed circuit cards is changed. Check to make sure the panel meter pointers are on zero and check V. ADJ. before the meter accuracy is checked. Check the calibration of the control unit every six months.
- Serial No.Date of Mfg.Calibration noticeGPM atRPM atHz
Check G.P.M. meter accuracy by application of a signal from the TS-4 calibrator to flowmeter jack (13) and make a comparison of the meter reading with the chart on battery holder (14). Check RPM meter accuracy by application of a signal from the TS-4 Calibrator to tachometer jack (15) and make a comparison of the meter reading with the chart on battery holder (14).
Safety Disc Replacement
Remove deflector shield (16) and unscrew safety disc retainer (17). Remove the ruptured disc. Install new disc (18) and tighten retainer (17) to 25 lb. ft. (3, 5).
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Torque force is achieved very suddenly; overtightening will lower the pressure at which the disc will rupture. |
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| NOTICE |
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Always make certain the correct safety disc is used. When testing machines with relief valve pressures above 3000 PSI (211 Kg/cm2), install a 1P7411 Safety Disc. When testing machines with relief valve pressures below 3000 PSI (211 Kg/cm2), install a 9S6341 Safety Disc. |
Operation Of The Flow Meter
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Fully open load valve (1) before starting any flow through meter. After opening load valve and before starting engine or pump, pull "ON" both the "G.P.M." (7) and "R.P.M." (8) switches. Turn both control knobs (10) and (11) to the (voltage) "V.ADJ." position. With meter face in horizontal position adjust electronic circuit voltage by turning VOLTAGE ADJUST potentiometers (9) until the meter needles align with red lines labeled "V.ADJ.". Read meter only from directly in front, so mirror image of needle is not visible. Readjust meters after machine oil has reached normal operating temperature, with the oil flow and the engine speed at the recommended test values. |
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Turn control knob (10) to either "B" or "F" position and control knob (11) to "A" position before starting engine or pump. This avoids possible damage to the meters should oil flow exceed the capacity of the flow meter "A" scale, or should engine speed exceed the limit of the tachometer "B" scale. If flow meter is installed in an "in-line" connection, most testing will probably be done with manual load valve fully open. If flow meter is installed in a "tee-test" connection, use the manual load valve to control test pressure at any level below the maximum pressure relief valve cracking pressure.
Troubleshooting Flow Meter
Disassembly Of Flow Meter
(1) Disassembly of the hydraulic flow meter is required to perform many of the adjustments or repairs. Complete disassembly of the flow meter is covered here. The flow meter can then be disassembled to the point necessary to perform required checks or repairs. Remove seven screws (1) from both boxes and slide covers (2) straight up. Always place the flow meter case on a bench free from metal chips. The magnets in the meters will attract small metal particles.
(2) Using needle nose pliers, disconnect the wire leads between the circuit board and its cover, and the flow meter block and its cover.
NOTE: For meter removal and disassembly, see the topic, "Adjusting Meter Pivots." For disassembly of the flow meter block, continue with step 3.
(3) Remove pressure gauge (3). The pressure gauge hex head is at location (A).
(4) Remove four screws (4), to expose the thermometer probe and turbine transducer. (Before reinstalling the flow meter turbine transducer, see the topic, "Adjusting Turbine Magnetic Transducer".)
Disassembly Of Pressure Control Valve
(1) To disassemble the pressure control valve, remove the four bolts (5) and twist the pressure control valve handle housing from the flow block. Using a long rod or screwdriver, push the pressure control valve from the flow block.
(2) Check orifice (6) for plugging. To disassemble the pressure control valve handle assembly, back the handle out, drive out roll pin (7), pull the handle off, and turn the shaft out the forward end.
NOTE: In any disassembly operation, install new seals if the flow meter has been used on a machine with water glycol hydraulic fluid.
Disassembly Of Flow Meter Turbine
(1) Remove flow meter turbine assembly (8) by removing the turbine retaining snap ring. Slide the turbine assembly out. When reassembling, always install flow straightener (9), containing the spring, toward the snap ring.
(2) To remove the turbine and bearing assembly from the turbine shaft, tap the shaft out of the bearing. To remove the turbine bearing, remove the bearing retaining snap ring and tap the bearing out of the turbine from the opposite side.
NOTE: The complete 9S2000 Flow Meter must be returned to a repair center, if the turbine is replaced, in order to recalibrate it against a master flow block.
Flow Meter Circuit Check
(1) The circuit through either meter of the flow meter can be checked while hooked up to "Tee Test" a machine, provided the remaining meter circuit is operating correctly. To test the GPM circuit, remove the battery holder and disconnect the flow meter turbine transducer plug. Disconnect the tach generator cable from the RPM INPUT and plug it into the flow meter turbine transducer jack in the battery holder. With the GPM switch pulled ON, and with the selector switch on "B", start the engine and slowly accelerate it. If the GPM meter registers, the circuit is operating correctly. The problem is in flow meter turbine, its magnetic transducers, its lead, its transducer adjustment, or the electronic cable assembly. If the problem is in the GPM circuit, check the rotary switch for signs of corrosion. If corrosion is found, place the meter case in an oven at 150°F (66°C) for 4 hours (CAUTION: DO NOT EXCEED 175°F (80°C). Then spray with 7M73 Corrosion Inhibitor.
(2) To determine if the problem is in the RPM circuit of the flow meter, first check the condition of the tach generator cable. See the topic, "Checking Tach Generator Cable", Page 27. After it has been found to be in good condition, disconnect the end of the tach generator cable from the battery holder jack and plug it into the RPM INPUT. This will place it between the flow meter turbine lead and the RPM INPUT jack. With the RPM switch pulled ON and the selector switch on "A", start the engine and slowly engage the lift lower control lever. If the needle on the RPM meter starts to rise as the lift lower control lever is engaged, the RPM circuit in the flow meter is operating correctly. The problem is in the tach drive, tach generator adjustment, its lead, or its magnetic transducer. Should the problem be found in the RPM circuit, check the rotary switch for signs of corrosion. If corrosion is found, place the flow meter case in an oven at 150°F (66°C) for 4 hours (CAUTION: DO NOT EXCEED 175°F (80°C) and spray with 7M73 Corrosion Inhibitor.
(3) The circuits through either meter of the flow meter can also be tested on a work bench using a tach generator known to be good. Turn the GPM selector switch to "A" and the RPM selector switch to "B". Remove the battery holder and disconnect the flow meter turbine jack. Plug the tach generator lead into the flow meter turbine jack in the battery holder and pull the GPM switch on. Rotate the tach generator shaft rapidly by hand. If the GPM meter registers, the circuit is operating correctly.
(4) Disconnect the tach generator lead from the flow meter jack, plug it into the RPM INPUT, and pull the RPM switch on. Rotate the tach generator shaft rapidly by hand. If the RPM meter registers, the circuit is operating correctly. Should the problem be found in the GPM or RPM circuits, check the rotary switch for signs of corrosion. If corrosion is found, place the flow meter case in an oven at 150°F (66°C) for 4 hours (DO NOT EXCEED 175°F (80°C) and spray with 7M73 Corrosion Inhibitor.
Tach Generator Cable Check
(1) The tach generator cable can be checked either on the flow meter while hooked up to "Tee Test" a machine or by bench testing with an ohmmeter. When mounted on a machine, turn the GPM switch ON, turn the GPM selector switch to "B", set the engine speed at high idle, and back the pressure control valve out. Engage one hydraulic control lever on the machine and record the GPM meter reading.
(2) Remove the battery holder, disconnect the flow meter turbine plug, and install the tach generator cable between the flow meter turbine plug and the GPM circuit jack in the battery holder. Repeat step 1; if the GPM meter reading is the same as the first time, the tach generator cable is not defective. Rotate and pull the tach cable ends during test to check for loose wires. Limit the pull to 5 lbs. (2,3 kg) maximum.
(3) To check the tach cable assembly with an ohmmeter, check continuity of the center wire and the shield wire.
(4) Check for a short circuit between the center and shield wire. Check for loose connections in the jack. Should either the center wire or shield wire show an open or a short circuit between them, the ends can be unscrewed and visually checked for the difficulty.
Electronic Cable Assembly Check
(1) Check the electronic cable assembly with an ohmmeter, check continuity of the cable and check for shorts in the cable and connectors. Connector legend: A-ground, B-flow meter, C-thermometer and D-thermometer.
Check Of 5P7360 Tachometer Generator Magnetic Transducer (Formerly 9S3047)
The magnetic transducer and lead for the tachometer generator can be checked with an ohmmeter. The resistance for the transducer and lead is 3800 ± 400 ohms. Earlier tachometer generators (with molded plug) give a reading of 1200 ± 240 ohms. Sometimes a static test of the generator is not enough and a dynamic test may be necessary. See the following procedure "Check of 5P7360 Tachometer Generator Operation" (formerly 9S3047).
Check Of 5P7360 Tachometer Generator Operation (Formerly 9S3047)
(1) Plug the tachometer generator lead into the RPM INPUT jack on the front panel. Turn RPM switch "ON" and rotate the selector switch to position "A". Rotate the tachometer generator shaft rapidly by hand. If the meter gives any reading at all, the tachometer generator is probably operating correctly. If the 9S2000 is faulty too, use the 5P3600 Flowmeter, or 1P5500 Phototach to see if the 5P7360 is operating correctly.
Another procedure that can be used to check the tachometer is to connect the tachometer generator to a VOM and use a small electric drill (1000 RPM) as shown to turn the tachometer generator. The reading on the scale will be .5 to 1.5 volts - A.C. If the A.C. output voltage is too low, see the following procedure; (ADJUSTMENT OF THE 5P7360 TACHOMETER GENERATOR).
Adjustment Of 5P7360 Tachometer Generator (Formerly 9S3047)
Sensitivity (output voltage) of the tachometer generator is determined by the distance from the magnetic transducer to the gear teeth on the drive shift. If the transducer is not near the gear teeth, a constant reading will not show on the tachometer at low engine RPM. If the transducer is too far from the gear teeth, no reading will show at any engine speed.
To adjust the tachometer generator, loosen locknut (1). Turn magnetic transducer (2) clockwise while rotating drive shaft (3) by hand. When adjustment is correct, you can feel the drive shaft gear teeth making contact with the end of the transducer. Tighten locknut (1). Check the adjustment by rotating drive shaft (3). The gear teeth should not make contact with the transducer after the locknut is tightened.
Adjusting Turbine Magnetic Transducer
The sensitivity of the flow meter is determined by the distance from the turbine magnetic transducer to the end of the turbine blades. The GPM meter will not read at low flows or readings will be erratic at low flows if the magnetic transducer is either too close to or slightly too far from the end of the blades. Possibly no reading will be shown at any flow if the transducer is touching, or is adjusted extremely far from, the ends of the turbine blades.
(1) To adjust the turbine magnetic transducer, remove the turbine magnetic transducer assembly (1) and disassemble it. Check seals (2) and (3). Remove thermometer probe (4) from the flow block and check its seal. Remove the pressure control valve as outlined in the topic, "Disassembling the 9S2000 Hydraulic Flow Meter", Page 16. Reassemble the turbine magnetic transducer assembly, turning seal jam nut (5) onto magnetic transducer (6) as far as possible.
(2) With a flashlight shining through the pressure control valve handle assembly port, reinstall the turbine magnetic transducer assembly in the flow block while sighting down the inlet. Turn the transducer in by hand until its end just touches the end of a turbine blade by visual sighting.
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DO NOT FORCE THE TRANSDUCER END INTO THE TURBINE BLADE. THIS WILL DAMAGE THE TURBINE COMPONENTS. |
(3) Back the turbine magnetic transducer out 1/4 to 1/3turn. Tighten the seal jam nut against the flow block while holding the magnetic transducer as shown. Reinstall the thermometer probe.
Check Of Battery Circuit
The battery circuit can show an open or low voltage due to corrosion either at the battery or in the battery holder ends between the rivets and solder lugs. The existence of these or other problems in the battery circuit can be determined with a voltmeter. Make all checks with both the GPM and RPM switches pulled on and both selector switches on V-Adj.
(1) Check the voltage through each battery holder individually by contacting the end rivets. If an open or low voltage is detected, remove and check that battery individually. Check the overall battery holder voltage. If an open or low voltage is detected in the overall battery holder voltage test, check the connection between each rivet and its solder lug with an ohmmeter. Rotate the connector slightly to correct a faulty connection. Use electronic contact cleaner to clean rivet joints in the battery holder or other contact points, such as the rotary switches, in the flow meter.
Check Of Magnetic Transducer And Leads
The magnetic transducers and leads for both the flow meter turbine and the tach generator can be checked with an ohmmeter test. The resistance values for each of the transducers and leads are as follows:
Flow Meter Turbine Magnetic Transducer 3800 ohms ± 400 ohms
(1) Flex the leads while performing this check.
| NOTICE |
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While some tach magnetic transducers are similar in appearance to the turbine magnetic transducer, never use a tach generator magnetic transducer in the flow block in place of a turbine magnetic transducer. Any turbine magnetic transducer can be used as a tach generator magnetic transducer. |
Check Of Thermometer Probe
(1) The thermometer probe can be checked with an ohmmeter test. Let the thermometer stabilize at room temperature for a minimum of one hour. The resistance through the thermometer probe varies widely with temperature. The chart above gives the resistance in the normal range of temperatures encountered. Do not leave the ohmmeter connected to the leads, as current from the ohmmeter will heat the probe, causing the resistance to change.
(2) The thermometer circuit in the circuit board can be checked by imposing resistance across the socket for the thermister leads. Connect a 1% tolerance resistor with a rating of 2000 ohms across the socket for the thermister leads; the reading should be 213.5°-214.5°F (100.7°-101.3°C). If this temperature is not correct, adjust the potentiometer marked "F" on the circuit board to get the correct calibration. In addition, use a 10.00K ohm 1% resistor to check instrument accuracy. This resistor should produce a reading of 123.5°-129.5°F (50.8°-54.1°C). If not, replace the 1555-1 meter.
Meter Pivot Adjustment
The necessity of adjusting the meter pivots can usually be determined by striking the glass over the meter face soundly with a forefinger and watching the resultant needle movement. If the needle tip moves up and down, even slightly, the meter pivots need adjustment. Side to side needle tip movement is usually minimal on a properly adjusted meter.
(1) To adjust meter pivots, remove the four nuts (1) which provide electrical contact from the circuit board to the meter terminals. Remove the two wing nuts (2) and brackets which hold each meter in place. The meter or meters requiring adjustment can then be slipped out the front of the case by bending the circuit board slightly outward.
(2) Remove the two studs which hold the meter case together. The stud hex requires a 1/4" (6,4) wrench. Gently pull the plastic glass frame from the meter face from the bottom side. If aluminum meter face extends over the black plastic meter face base, shave the edge of the aluminum face with a sharp knife until it is slightly smaller.
(3) To tighten a loose pivot, loosen the locknut with a 5/32" wrench and turn the pivot adjusting screw. Turn the screw clockwise very gradually in 1/16 turn increments. After each increment turned, gently blow the needle across the face of the meter. When the needle does not return to zero, the bearing is overtightened. Loosen the adjusting screw until the needle does return to zero after being blown across the meter face. Hold the screw while tightening the locknut.
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OVERTIGHTENING THE PIVOTS WILL CRACK THE BEARING. |
(4) To make the final check for proper bearing adjustment, short across the meter terminals and once again blow the needle across the face of the meter. The needle should return very slowly to near zero. A light tapping should bring the needle to zero. If not, loosen the bearings slightly.
(5) When installing the plastic glass frame over the meter face, be sure that "zero adjust" lug (3) is aligned with slot (4) in the meter base.
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Do not overtighten the meter studs when reinstalling as this can distort the meter or strip threads in the case. Overtightening wing nuts can also distort the meter. |
(6) Reassemble the flow meter, and readjust the "zero adjust" and "V-Adj." as outlined in the topic, "Meter Calibration", on Page 41.
Meter Calibration
Adjust G.P.M. scales as follows: (A) Turn control knob to proper scale. (B) Apply signal generator frequency from TS-4 calibrator at jack (13) as listed in chart on battery holder (14). (C) Read appropriate meter scale and adjust reading to specifications using a screwdriver at rear of corresponding potentiometer. Calibrate with meter faces in horizontal position.
Adjust R.P.M. scales as follows: (A) Turn control knob (11) to proper scale. (B) Apply signal generator frequency from TS-4 calibrator at jack (15) as listed in chart on battery holder (14). (C) Read appropriate meter scale and adjust reading to specifications using a screwdriver at rear of corresponding potentiometer.
Parts List For 9S2000 Hydraulic Flow Meter
Refer to page 50 for additional parts information, including the price of each part.
A 1608 Upper Gasket
B 1609 Lower Gasket
1 2018 Thermometer Probe 1334-5/16 Thermometer Probe Seal 2 1226-5K 5000 PSI Pressure Gauge
3 1601 Safety Disc Body
4 1039-150 Turbine Retaining Ring
FLOW BLOCK AND HOUSING ASSEMBLY
5 1334-11/16 Transducer Seal
6 1332 Transducer Seal Nut
7 SM1200 Magnetic Transducer
8 1012-016 Transducer Nut O-Ring
TURBINE MAGNETIC TRANSDUCER ASSEMBLY
9 1084 Valve Stem
10 1088-1 Roll Pin
11 1233 Handle
12 1012-222 Pilot Valve Assembly External O-Ring
13 2029 Valve Body
14 1012-011 Valve Stem O-Ring
15 1013-06 Back-Up Washer
16 1080 Seal Gland
17 1039-62 Valve Retaining Ring A-2013 Pilot Valve Body Assembly
(Contains all parts 9 thru 17 above.) 
A2013 PILOT VALVE BODY ASSEMBLY
18 1013-27 Poppet Back-Up Washer
19 1012-222 Poppet Valve O-Ring
20 1076-2 Valve Poppet
POPPET VALVE ASSEMBLY
21 1405 Outlet Straightening Section
22 1401 Inlet Straightening Section 1419 Turbine Shaft Spring 23 1404 Outlet Cone
24 1402 Turbine Shaft
25 1403 Inlet Cone
26 1039-50 Turbine Brg. Retaining Rings
27 * Turbine
28 1041-2 Turbine Bearing
TURBINE ASSEMBLY
*When replacing the turbine, return the entire 9S2000 Hydraulic Flow Meter to a repair center for calibration to the master flow meter.
29 2288 Magnetic Transducer
30 1773 Transducer Locknut
31 1574-G Gear Tach Body 1575-2 Rear Tach Bearing
1575-3 Front Tach Bearing
1579 Shoulder Bushing 32 1580-1 Tach Coupling Nut
33 3382 Drive Tip
34 3383 Drive Tip Retaining Ring
TACH GENERATOR ASSEMBLY
35 1555-1 GPM Meter
36 1555-2 RPM Meter
37 9S3048 Tach Cable Assembly
38 5P7360 Tach Generator Assembly (formerly 9S3047) 9S6341 Safety Disc (431 PSI, .010" (0.25) Thick)
1P7411 Safety Disc (6200 PSI, .013" (0.34) Thick) 39 2P5523 Electronic Cable Assembly
9S2000 HYDRAULIC FLOW METER
The following parts are available from Caterpillar:
Troubleshooting The Electrical Components
This section is written as an aid for troubleshooting the Flow Meter for electronic technicians only. It must not be used by service personnel with no training or knowledge of electronics.
Removal And Replacement Of Components
Remove the silicone rubber sealant by cutting the rubber away from the part. Cut the connecting wires of the component and remove the component from the circuit board. Use a 25-75 watt soldering iron with a clean .12" (3,0) tinned tip and remove the remainder of the wires, one at a time. This can be done on the foil side of the board. Use either Dri-Wick and the iron or drill through the solder from the component side of the board with a fine drill.
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Too much heat causes separation of the foil. Remove the remainder of the varnish from the foil with a knife. Install the new part with .03" (0,8) rosin core solder of 60/40 or 63/37 alloy. Do not use acid core solder. |
IMPORTANT: Never install a removed part; at all times, install new components.
Clean the solder with alcohol or trichlorethylene. Make a check of the circuit to be sure that it is in operating condition. Paint the areas where the varnish was removed.
IMPORTANT: Installation of components by methods other than the directions above can cause damage to the circuit board.
Basic Electronic Troubleshooting
More than half of the circuit problems are caused by failure of the batteries, the unit that holds the batteries and the meter movement. Up to 90% of all circuit problems can be found by inspection, ohmmeter and voltmeter checks, the wet finger method and the probable cause chart shown below.
Voltmeter Test
The voltages listed below are the results of readings taken between the test points and the ground foil or the negative side of the battery. To get similar voltmeter indications, a meter of 20,000 or more ohms per volt must be used. All voltages are ± 10% except where specified. All test points with an (A) after the number are for the flow meter and those with a (B) after the number are for the tachometer. When taking voltmeter tests, do not use any outside input to the instrument. Check the V. ADJ. with the meters in the horizontal position before starting the tests.
Oscilloscope Test
The following photos are for those technicians who want to use an oscilloscope for troubleshooting. To get similar indications, connect the FLO-TECH TS-4 SIGNAL GENERATOR into the appropriate input GPM or RPM of the 9S2000 HYDRAULIC FLOW METER and adjust it for 200 HZ. Photos are shown with a vertical sensitivity of 0.5 V/cm and a sweep of 2 milli-seconds/cm. The straight horizontal trace in each photo is circuit ground. All traces are shown with respect to circuit ground.
Parts Information
Write to Flo-Tech, Inc., 403 South Washington Boulevard, Mundelein, Illinois 60060 U.S.A., to get parts for service replacement. Any orders for the following parts must be sent directly to them. The prices shown can change at any time. These prices do not include any export, duty or shipping costs.
NOTE: All orders should be a minimum of $dollar;5.00 plus shipping costs.
The description of the components is complete enough to get similar components locally. But, it is the recommendation of Flo-Tech, Inc., that the "Electronic Components" should be ordered directly from them. This recommendation is made because of the different quality of parts from manufacturer to manufacturer. Components from other sources will not necessarily be of the correct size to fit the circuit boards. Also, some components are not manufactured to the correct electrical tolerances and can prevent correct operation of the instruments. Many of the parts in the list are manufactured especially for these instruments and have no other application.
Service Parts
Electronic Hardware
Turbine Assembly
Gaskets And Seals
Safety Disc And Block Items
Electronic Components
9S2000 Hydraulic Flow Meter - Circuit Board Illustration, Test Points And Schematic
Installing 5P1719 Replacement Meter For The 9S2000 Hydraulic Flow Meter
(1) When replacing the meter, it is necessary to reuse the original scale face. Carefully remove the white scale face from the old and new meters. Then press the original face on the new meter. Once the new meter is installed in the test instrument, it is necessary to recalibrate the meter [see page 41 for calibration instructions].