Bench Test Procedure For Hydraulic Piston Pumps {5070} Caterpillar


Bench Test Procedure For Hydraulic Piston Pumps {5070}

Usage:

140 N94
Motor Grader
140 (S/N: N941-UP; N951-UP)

Introduction

Table 1
Revision  Summary of Changes in M0099990 
00  New Document. 

© 2018 Caterpillar All Rights Reserved. This guideline is for the use of Cat dealers only. Unauthorized use of this document or the proprietary processes therein without permission bay be violation of intellectual property law. Information contained in this document is considered Caterpillar: Confidential Yellow.

This Special Instruction includes test procedures for piston pumps. This Special Instruction also provides specifications. The technician should have a good understanding of hydraulic piston pumps. The technician should be educated in the operation of the hydraulic test bench. The test benches in this document are available through the Caterpillar Service Tool Division. Gather all necessary tooling before you need to hook up the pump. Some of the required tooling appears in a table at the end of this document. There are many possible variations of tooling that could be used. Not every possible variation can be listed.

For technical questions when using this document, work with your Dealer Technical Communicator (TC).

To report suspected errors, inaccuracies, or suggestions regarding the document, submit a form for feedback in the Service Information System (SIS Web) interface.

Canceled Part Numbers and Replaced Part Numbers

This document may not include all Canceled part numbers and replaced part numbers. Use NPR on SIS for information about Canceled part numbers and replaced part numbers. NPR will provide the current part numbers for replaced parts.

Safety



Illustration 1g02139237

------ WARNING! ------

Personal injury or death can result from improperly checking for a leak.

Always use a board or cardboard when checking for a leak. Escaping air or fluid under pressure, even a pin-hole size leak, can penetrate body tissue causing serious injury, and possible death.

If fluid is injected into your skin, it must be treated immediately by a doctor familiar with this type of injury.


------ WARNING! ------

Pump test pressures in this guideline may exceed the normal operating range of the hydraulic test hoses utilized when connecting the tested pump to the test bench. However, the order of magnitude of these pressures is significantly below the burst strength of the Caterpillar "XT6" product.

High pressure oil can escape through improperly assembled hoses and fittings. High pressure oil can also escape through poorly maintained hoses and fittings. High pressure oil may also leak through hose that has become damaged over the life of the hose due to the pressure levels that occur during test bench operation.

Personal injury or death can result from improper hose & fitting inspection or improper hose replacement procedures. Escaping fluid under pressure can penetrate body tissue causing serious injury, and possible death.

Thoroughly inspect all testing hoses, fittings, and quick disconnects prior to any testing operation. Check the assembly date tag or hose assembly log date for a hose life indicator. Replace all Test Bench hoses at a minimum of every 2 years or earlier if the hose or fittings appear to be damaged.


------ WARNING! ------

Hot oil and hot components can cause personal injury. Do not allow hot oil or hot components to contact skin.


Summary

This procedure is specific to the type of pump and the type of control. Refer to the test specifications and the tooling at the end of this document.

Note: A paper copy of this document may not be the latest version. Go to the Service Information System (SIS) to view the latest version.

References

Table 2
References 
Media Number  Title 
REHS1761  Required Tooling for Bench Testing Hydraulic Components 
SEBF8810  Hydraulic Pump, Motor, and Cylinder Bench Test Procedure Reference Manual 
SEHS8892  Operating Instructions for Caterpillar 1U-9400 Series Hydraulic Test Center 
NEHS0563  Tool Operating Manual for 9U-5000 Series Hydraulic Test Bench 

Connections for the Caterpillar Hydraulic Test Center



Illustration 2g01351819
Connections for the Test Center
(1) Flow control for discharge
(2) "F3" flow meter inlet
(3) "F4" flow meter inlet
(4) Oil supply from the auxiliary pump
(5) "F3" inlet for the flow meter with flow limiter
(6) "F3"outlet for the flow meter with pressure control
(7) Load sensing pressure
(8) Signal pressure
(9) "F4" outlet for the flow meter
(10) Return to tank
(11) Connections for case drain
(12) Oil supply


Illustration 3g01351822
Control and Gauges for the Test Center
(13) Meter for speed and torque
(14) Gauge for signal pressure
(15) Control for signal pressure
(16) Pressure gauge for auxiliary pump
(17) Auxiliary pump flow
(18) "F3" discharge pressure gauge
(19) "F3" discharge flow
(20) "F4" discharge pressure gauge
(21) "F4" discharge flow
(22) Auxiliary pump flow control
(23) "F3" margin pressure
(24) "F3" Load control for discharge pressure
(25) "F4" Load control for discharge pressure

Connections for the Caterpillar Hydraulic Test Bench



Illustration 4g01351830
Connections for the Test Bench
(26) "Flow meter 1" loop and "Flow meter 2" loop
(27) Oil Supply


Illustration 5g01351833
Connections for the test bench
(28) "Flow meter 2" loop
(29) "Flow meter 1" loop
(30) "Flow meter 2" outlet
(31) Signal pressure line
(32) "Flow meter 2" inlet
(33a) "Flow meter 1" outlet
(33b) Auxiliary oil supply outlet
(34) Auxiliary oil supply inlet
(35) "Flow meter 1" inlet


Illustration 6g01351834
Control and Gauges for the Test Bench
(36) Auxiliary oil supply pressure
(37) Signal pressure
(38) Control for signal pressure
(39) "Flow meter 1" discharge pressure
(40) Control for auxiliary oil supply pressure
(41) "Flow meter 2" discharge pressure
(42) Auxiliary oil supply control
(43) "Flow meter 2" discharge flow
(44) Discharge flow for auxiliary pump
(45) "Flow meter 1" discharge flow
(46) "Flow meter 1" load control
(47) Speed and direction control
(48) "Flow meter 2" load control

Tandem Pump Port Locations

This piston pump is produced with multiple type housings. Port locations will vary. Match the correct illustration with the pump that is being worked on.



Illustration 7g06373177
Typical port locations and adjustments.
(49) Adjustment screws for hydraulic zero
(50) Connectors for the electronic displacement control
(51) Adjustment screws for pressure limiter
(52) Gauge ports for system pressure
(53) Case drain ports
(54) Adjustment screws for pump displacement
(55) Gauge ports for stroking pressure
(56) Pump discharge ports
(57) Adjustment screw for charge pressure relief
(58) Crossover relief valves
(59) Gauge port for charge pressure
(60) Inlet for auxiliary flow


Illustration 8g06373425
(52) Gauge ports for system pressure
(53) Case drain ports
(55) Gauge ports for stroking pressure
(56) Pump discharge ports
(57) Adjustment screw for charge pressure relief
(59) Gauge port for charge pressure
(60) Inlet for auxiliary flow

9U-5902 Rectifier Block



Illustration 9g01351883
9U-5902 Rectifier Block Connections


Illustration 10g01352340
9U-5902 Rectifier Block Schematic
(63) High-pressure port
(64) High-pressure outlet
(65) High-pressure port
(66) Low-pressure inlet

9U-5893 Heat Exchanger



Illustration 11g01352341
9U-5893 Heat Exchanger Connections
(67) Inlet
(68) Outlet
(69) Water inlet
(70) Water outlet

Set up for the Front Pump

  1. Only test one pump at a time on tandem pumps. Isolate one of the pumps by connecting a hose between the discharge ports on the pump that is not being tested.

  2. A power supply is required to operate the solenoids. The power supply must deliver 0mA to 2A with an infinite setting in that range.

  3. Connect a power supply to solenoid (50A) or (50b) to operate the electronic displacement solenoid.

  4. Install 8T-0855 Pressure Gauges 4000 kPa (580 psi) on the gauge port for the charge pressure (59).

  5. Install 8T-0861 Pressure Gauges 60000 kPa (8600 psi) on the gauge ports for discharge pressure (52A) and (52B).

  6. Connect a hose from the test bench auxiliary oil supply to the inlet for auxiliary flow (58). The auxiliary oil supply should be capable of producing 3000 kPa (435 psi) and 56 L/min (14.8 US gpm).

    Note: Be sure to use XT-6ES rated hydraulic hose.

  7. Connect pump discharge ports (56A) and (56b) to the 9U-5902 Rectifier Block high-pressure ports (63) and (65).

  8. Connect the 9U-5902 Rectifier Block outlet (64) to the flow meter inlet on the test bench.

  9. Connect the flow meter outlet to the 9U-5398 Heat Exchanger inlet (67) .

  10. Connect the 9U-5398 Heat Exchanger outlet (68) to the low-pressure return (66) on the 9U-5902 Rectifier Block.

  11. Use the rear housing case drain port (53D) on tandem pumps. Fill the pump case with oil. Pour oil directly into a case drain port until the case is full.

  12. Connect an in-line flow meter to the case drain port (53D). Vent the case to the atmosphere. Make sure that the case drain flow is directed into the sump.

  13. Do not rotate the pump in the wrong direction. The correct direction of rotation will be stated on the pump. The correct direction of rotation will also be in the test specifications. The direction of rotation is viewed from the input shaft end. Visually check the pump for proper rotation.

Adjustment for Mechanical Zero Position for the Front Pump

Note: Before performing the adjustment for mechanical zero, the pump must be mechanically sound. Start rotating the pump according to step 1 of the test specifications. Verify that all connections are tight. Listen for abnormal noise. Check for leaks around shaft seals. Check for leaks around the control valves. For pumps not equipped with a charge pump, be sure to sustain charge pump flow to port (60) in Steps 1 through 5 of the mechanical zero adjustment.

  1. Turn the load control on the test bench completely clockwise. Turning clockwise will allow pump discharge pressure to increase in the following steps. Start rotating the pump at the value in Step 1 of the test specifications. This unit is not equipped with a charge pump. Be sure to sustain charge pump flow to port (60) in Steps 1 through 5 of the mechanical zero adjustment. If the mechanical zero adjustment is incorrect, a discharge pressure higher than the charge pressure may occur.

  2. Check the gauge ports for stroking pressure (55A) and (55B). Ensure that the pressure differential is less than 150 kPa (22 psi). Remove adjustment screws for the locking plate.

  3. Turn the adjustment screws for pump displacement (54A) and (54B) counterclockwise three turns.

  4. Stroke the pump by supplying current to (50A) until the stroking pressure at gauge port (55B) is 200 kPa (29 psi) greater than at gauge port (55A). Pressure should be greater at system pressure gauge port (52A) for clockwise rotation. Pressure should be greater at system pressure gauge port (52B) for counterclockwise rotation.

  5. Slowly turn the adjustment for pump displacement (54A) clockwise until the system pressure differential is less than 150 kPa (22 psi) between gauge ports (52A) and (52B). This procedure sets the servo piston and swashplate to mechanical zero on the (54A) side of the pump. Install and tighten the adjustment screw locking plates.

  6. Repeat steps 1 through 5, but stroke the pump in the opposite direction by supplying current to (50B).

  7. Stop rotating the pump. Turn the load control on the test bench for pump discharge pressure counterclockwise. Allow the discharge pressure of the pump to decrease. Disconnect pressure gauges from ports (52A) and (52B).

Adjustment for Hydraulic Zero Position for the Front Pump

  1. Connect two 6000 kPa (870 psi) 8T-0856 Pressure Gauges into both gauge ports for stroking pressure (55A) and (55B).

  2. Start rotating the pump to the value listed in step 1 of the test specifications. Turn the load control for the pump discharge pressure completely clockwise. Turning clockwise will allow pump discharge pressure to increase in the following steps. Turn the adjustment screw for the hydraulic zero (49A) clockwise. Continue to turn until a pressure increase is achieved. This pressure will be seen on the gauge port for stroking pressure (55A) or (55B). Mark the position of the adjustment screw for the hydraulic zero (49A).

    Note: Do not turn the adjustment screw for the hydraulic zero (49A) more than 90 degrees in either direction.

  3. Turn the adjustment screw for the hydraulic zero (49A) counterclockwise until pressure increases by the same value on the opposite stroking pressure port (55A) or (55B). Mark the position of the adjustment screw for the hydraulic zero (49A).

  4. Turn the adjustment screw for hydraulic zero (49A) clockwise to the midpoint of both marks. The pressure at the gauge ports for the stroking pressure (55A) and (55B) should differ by less than 150 kPa (22 psi).

  5. Hold the adjustment screw for hydraulic zero (49A) and tighten the locknut.

  6. Turn the load control for the pump discharge pressure counterclockwise. Turning the load control will allow pump discharge pressure to decrease. Stop rotating the pump and allow pump pressure to dissipate.

Test Procedure for the Front Pump

The ISO contamination rating of the hydraulic oil in the test bench should be ISO 16/13 or cleaner. test bench should be one of the following.

  • SAE 10W at 50 °C (122 °F) or

  • Mobil DTE-11 at 46 °C (115 °F)

Note: The following test procedure steps correlate with the numbered steps in the test specification section according to your specific part number.



Illustration 12g01395229
EDC Current Vs. Pump Flow

  1. The following steps verify the operation of the charge relief valve. Start rotating the pump according to step 1 of the test specifications for several minutes to bring the oil to operating temperature. Pumps without a charge pump will require auxiliary charge flow according to the value in step 1 of the test specifications. For pumps with an internal charge pump, the charge flow can be measured through the case drain port (55). Verify that all connections are tight. Listen for abnormal noise. Check for leaks around shaft seals. Check for leaks around the control valves. Check the gauge port for the charge pressure (59). Compare the actual charge pressure with the value in step 1 of the test specifications. If the charge pressure is not within the test specifications, adjust the charge relief valve. Adjust the charge relief valve by turning the adjustment screw (57) clockwise or counterclockwise accordingly.

    Note: Be sure that the front pump is mechanically and hydraulically zeroed before continuing to Step 2 of the test procedure.

  2. The following steps verify the operation of the electronic displacement control and the initial point of pump stroke.

    Slowly increase the input RPM to the value listed in step 2 of the testing specifications. Slowly increase the current to the solenoid (50A) or (50B) to the value in step 2 of the test specifications. The value listed in the test specifications is the beginning of the pump stroke. Some flow meters may not be able to read discharge flows at the initial or low flow rates. Slowly increase the solenoid current until the flow meter can read the discharge flow. This is the initial point of pump stroke.

  3. Slowly increase the input RPM according to Step 3 of the test specifications. Slowly increase the current to solenoid (50A) or (50B) to the value in Step 3 listed in the test specifications. The pump should be at full stroke at this point. Record actual pump flow. The pump is to be internally inspected if the discharge flow does not match the value in Step 3 of the test specifications.

  4. The following step will check the pressure limiter setting of the pump. Slowly increase the pump discharge pressure to the value in Step 4 of the test specifications. If the pressure limiter setting does not equal the value in Step 4 of the test specifications, adjust the pressure limiting adjustment screw (51A) or (51B) until the pressure is within specification.

  5. Keep the discharge pressure the same as the value in Step 4. Measure pump leakage at this point. Calculate the total loss. If the total loss is higher than the allowable value in Step 4 of the test specifications, The pump may not be mechanically feasible.

    Subtract the discharge flow in Step 4 from Step 3. The remainder is your total loss.

    Example "Step 3 flow" 162 L/min (42.8 US gpm) - "Step 4 flow" 158 L/min (41.7 US gpm) ="total loss" 4 L/min (1.1 US gpm). The "max. allowable loss" is 7.2 L/min (1.9 US gpm).

    The pump in the example is acceptable because the actual total loss is less than the maximum allowable loss.

  6. Repeat step 1 through step 5 for the opposite side of the pump. Supply current to solenoid (50A) or (50B).

------ WARNING! ------

Hot oil and hot components can cause personal injury. Do not allow hot oil or hot components to contact skin.


Reduce RPM and all pressure to zero. Remove the component from the test bench. Drain the oil from the pump. Plug all of the ports.

Set up for the Rear Pump

  1. Only test one pump at a time on tandem pumps. Isolate one of the pumps by connecting a hose between the discharge ports on the pump that is not being tested.

  2. A power supply is required to operate the solenoids. The power supply must deliver 0mA to 2A with an infinite setting in that range.

  3. Connect a power supply to solenoid (50C) or (50D) to operate the electronic displacement solenoid.

  4. Install 8T-0855 Pressure Gauges 4000 kPa (580 psi) on the gauge port for the charge pressure (59).

  5. Install 8T-0861 Pressure Gauges 60000 kPa (8600 psi) on the gauge ports for discharge pressure (52C) and (52D).

  6. Connect a hose from the test bench auxiliary oil supply to the inlet for auxiliary flow (60). The auxiliary oil supply can produce up to 3000 kPa (435 psi) and 56 L/min (14.8 US gpm).

    Note: Be sure to use XT-6ES rated hydraulic hose.

  7. Connect pump discharge ports (56C) and (56D) to the 9U-5902 Rectifier Block high-pressure ports (63) and (65).

  8. Connect the 9U-5902 Rectifier Block outlet (64) to the flow meter inlet on the test bench.

  9. Connect the flow meter outlet to the 9U-5398 Heat Exchanger inlet (67).

  10. Connect the 9U-5398 Heat Exchanger outlet (68) to the low-pressure return (66) on the 9U-5902 Rectifier Block.

  11. Use the rear housing case drain port on tandem pumps. Fill the pump case with oil. Pour oil directly into a case drain port (53D) until the case is full.

  12. Connect an in-line flow meter to the case drain port (53D). Vent the case to the atmosphere. Make sure that the case drain flow is directed into the sump.

  13. Do not rotate the pump in the wrong direction. The correct direction of rotation will be stated on the pump. The correct direction of rotation will also be in the test specifications. The direction of rotation is viewed from the input shaft end. Visually check the pump for proper rotation.

Adjustment for Mechanical Zero Position for the Rear Pump

Note: Before performing the adjustment for mechanical zero, the pump must be mechanically sound. Start rotating the pump according to step 1 of the test specifications. Verify that all connections are tight. Listen for abnormal noise. Check for leaks around shaft seals. Check for leaks around the control valves. For pumps not equipped with a charge pump, be sure to sustain charge pump flow to port (60) in Steps 1 through 5 of the mechanical zero adjustment.

  1. Turn the load control on the test bench completely clockwise. Turning clockwise will allow pump discharge pressure to increase in the following steps. Start rotating the pump at the value in Step 1 of the test specifications. This unit is not equipped with a charge pump. Be sure to sustain charge pump flow to port (60) in Steps 1 through 5 of the mechanical zero adjustment. If the mechanical zero adjustment is incorrect, a discharge pressure higher than the charge pressure may occur.

  2. Check the gauge ports for stroking pressure (55C) and (55D). Ensure that the pressure differential is less than 150 kPa (22 psi). Remove adjustment screws for the locking plate.

  3. Turn the adjustment screws for pump displacement (54C) and (54d) counterclockwise three turns.

  4. Stroke the pump by supplying current to (50D) until the stroking pressure at gauge port (55C) is 200 kPa (29 psi) greater than at gauge port (55D). Pressure should be greater at system pressure gauge port (52D) for clockwise rotation. Pressure should be greater at system pressure gauge port (52C) for counterclockwise rotation.

  5. Slowly turn the adjustment for pump displacement (54C) clockwise until the system pressure differential is less than 150 kPa (22 psi) between gauge ports (55C) and (55D). This procedure sets the servo piston and swashplate to mechanical zero on the (54c) side of the pump. Install and tighten the adjustment screw locking plates.

  6. Repeat steps 1 through 5 but stroke the pump in the opposite direction by supplying current to (50C).

  7. Stop rotating the pump. Turn the load control on the test bench for pump discharge pressure counterclockwise. Allow the discharge pressure of the pump to decrease. Disconnect pressure gauges from ports (52C) and (52D).

Adjustment for Hydraulic Zero Position for the Rear Pump

  1. Connect two 6000 kPa (870 psi) 8T-0856 Pressure Gauges into both gauge ports for stroking pressure (55C) and (55D).

  2. Start rotating the pump to the value listed in step 1 of the test specifications. Turn the load control for the pump discharge pressure completely clockwise. Turning clockwise will allow pump discharge pressure to increase in the following steps. Turn the adjustment screw for the hydraulic zero (49B) clockwise. Continue to turn until a pressure increase is achieved. This pressure will be seen on the gauge port for stroking pressure (55C) or (55D). Mark the position of the adjustment screw for the hydraulic zero (49B).

    Note: Do not turn the adjustment screw for the hydraulic zero (49B) more than 90 degrees in either direction.

  3. Turn the adjustment screw for the hydraulic zero (49B) counterclockwise until pressure increases by the same value on the opposite stroking pressure port (55C) or (55D). Mark the position of the adjustment screw for the hydraulic zero (49B).

  4. Turn the adjustment screw for hydraulic zero (49B) clockwise to the midpoint of both marks. The pressure at the gauge ports for the stroking pressure (55C) and (55D) should differ by less than 150 kPa (22 psi).

  5. Hold the adjustment screw for hydraulic zero (49B) and tighten the locknut.

  6. Turn the load control for the pump discharge pressure counterclockwise. Turning counter-clockwise will allow pump discharge pressure to decrease. Stop rotating the pump and allow pump pressure to dissipate.

Test Procedure for the Rear Pump

The ISO contamination rating of the hydraulic oil in the test bench should be ISO 16/13 or cleaner. test bench should be one of the following.

  • SAE 10W at 50 °C (122 °F) or

  • Mobil DTE-11 at 46 °C (115 °F)

Note: The following test procedure steps correlate with the numbered steps in the test specification section according to your specific part number.



Illustration 13g01395229
EDC Current Vs. Pump Flow

  1. The following steps verify the operation of the charge relief valve. Start rotating the pump according to step 1 of the test specifications for several minutes to bring the oil to operating temperature. Pumps without a charge pump will require auxiliary charge flow according to the value in step 1 of the test specifications. For pumps with an internal charge pump, the charge flow can be measured through the case drain port (55). Verify that all connections are tight. Listen for abnormal noise. Check for leaks around shaft seals. Check for leaks around the control valves. Check the gauge port for the charge pressure (59). Compare the actual charge pressure with the value in step 1 of the test specifications. If the charge pressure is not within the test specifications, adjust the charge relief valve. Adjust the charge relief valve by turning the adjustment screw (57) clockwise or counterclockwise accordingly.

    Note: Be sure that the rear pump is mechanically and hydraulically zeroed before continuing to Step 2 of the test procedure.

  2. The following steps verify the operation of the electronic displacement control and the initial point of pump stroke.

    Slowly increase the input RPM to the value listed in step 2 of the testing specifications. Slowly increase the current to the solenoid (50C) or (50D) to the value in step 2 of the test specifications. This is the beginning of the pump stroke. Some flow meters may not be able to read discharge flows at the initial or low flow rates. Slowly increase the solenoid current until the flow meter can read the discharge flow. Visually check that discharge pressure until the pressure starts to rise above the charge pressure. This is the initial point of pump stroke.

  3. Slowly increase the input RPM according to Step 3 of the test specifications. Slowly increase the current to solenoid (50C) or (50D) to the value in Step 3 in the test specifications. The pump should be at full stroke at this point. Record actual pump flow. The pump is to be internally inspected if the discharge flow does not match the value in Step 3 of the test specifications.

  4. The following step will check the pressure limiter setting of the pump. Slowly increase the pump discharge pressure to the value in Step 4 of the test specifications. If the pressure limiter setting does not equal the value in Step 4 of the test specifications, adjust the pressure limiting adjustment screw (51C) or (51D) until the pressure is within specification.

  5. Keep the discharge pressure the same as the value in Step 4. Measure pump leakage at this point. Calculate the total loss. If the total loss is higher than the allowable value in Step 4 of the test specifications, The pump may not be mechanically feasible.

    Subtract the discharge flow in Step 4 from Step 3. The remainder is your total loss.

    Example "Step 3 flow" 162 L/min (42.8 US gpm) - "Step 4 flow" 158 L/min (41.7 US gpm) ="total loss" 4 L/min (1.1 US gpm). The "max. allowable loss" is 7.2 L/min (1.9 US gpm).

    The pump in the example is acceptable because the actual total loss is less than the maximum allowable loss.

  6. Repeat step 1 through step 5 for the opposite side of the pump. Supply current to solenoid (50C) or (50D).

------ WARNING! ------

Hot oil and hot components can cause personal injury. Do not allow hot oil or hot components to contact skin.


Reduce RPM and all pressure to zero. Remove the component from the test bench. Drain the oil from the pump. Plug all of the ports.

Test Specifications

Table 3
Part Number  _________________________ 
Pump Rotation  _________________________ 
Step  1  2  3  4  5 
RPM  _______________  _____________  _______________  _____________  _____________ 
Solenoid Current mA (EDC control)  _______________  _____________  _______________  _____________  _____________ 
Discharge Pressure kPa (psi)  _______________  _____________  _______________  _____________  _____________ 
Discharge Flow lpm (gpm)  _______________  _____________  _______________  _____________  _____________ 
Pump Loss lpm (gpm)    _____________  _____________ 
Charge Relief Pressure kPa (psi)  _______________  _____________  _______________  _____________  _____________ 

Table 4
Part Number  519-7781 
Pump Rotation  CCW 
Step  1  2  3  4  5 
RPM  800 rpm  2000 rpm  1600 rpm  1600 rpm  -(1) 
Solenoid Current mA (EDC control)  330 mA  920 mA  920 mA 
Discharge Pressure kPa (psi)  2400 kPa (350 psi)(2)  2400 kPa (350 psi)(2)  2400 kPa (350 psi)(2)  36000 kPa (5220 psi) 
Discharge Flow lpm (gpm)  1 L/min (0.26 US gpm)  96 L/min (25 US gpm)  96 L/min (25 US gpm) 
Pump Loss lpm (gpm)  Subtract the actual measured discharge flow in Step 5 from the actual discharge flow in Step 3. The remainder is the total loss.  7 L/min (2 US gpm) 
Charge Relief Pressure kPa (psi)  2400 kPa (350 psi)  2400 kPa (350 psi)  2400 kPa (350 psi)  2400 kPa (350 psi) 
(1) The cross over relief valve reaches pressures too high for bench testing. This valve should be tested only after the pump is installed on the machine. Refer to appropriate machine Testing and Adjusting specifications.
(2) Discharge pressure equals charge pressure

Test Bench Tooling

Table 5
Part Number  Mounting Plate  Drive Adapter  Gauge Ports for Charge Pressure  Case Drain Ports  Gauge Ports for the Servo  Pump Discharge Ports  Inlet for Auxiliary Flow  Gauge Ports for System Pressure 
519-7781  1U-9128  133-2329  9/16-18 STOR  1-5/16-12 STOR  7/16-20 STOR  Split Flange 6V-0400
Flange Adapter 9U-7439 
1 1/16–18 STOR  9/16-18 STOR 

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