Usage:
CS-531C (5ZN, 9RN),
CP-533C (3XN, 3YN),
CS-533C (2WN, 2XN),
CP-563C (5JN, 5KN),
CS-563C (4KN, 4LN),
CS-573 (8PK),
CS-583C (7MN, 7NN) Vibratory Compactors
- SUPPLEMENT: APRIL 26, 1999
Service Magazine SEPD0390, Article 12, Page 12, November 10, 1997; "New Propel Motors Have Adjustable Maximum Displacement Screws".
The Service Magazine article is incorrect and should be replaced with "New Propel Motors Have Adjustable Maximum Displacement Screws" in SEPD0452, Article 11, Page 13. "New Propel Motors Have Adjustable Maximum Displacement Screws" in SEPD0390 should be deleted.
--------------- END SUPPLEMENT ---------------
Description of Change: A maximum displacement adjustable screw has been added to the drum and axle propel motors. This change allows more accurate synchronization of the drum and axle propel systems in low range. The displacement was only adjustable in high range on previous motors.
Adaptable To: The former Motor (Axle) and Motor (Drum) have been discontinued. The part number of the new axle motor is 123-5260. The part number of the new drum motor is 123-5259. See the chart for the effectivity of the new drum and axle motors.
The new motors are adaptable to all previous machines for the listed models. When the motors are replaced, the propel synchronization procedure in the service manual is no longer valid. Follow the procedure below to synchronize the new drum and axle motors.
Procedure To Synchronize Propel And Drum Motors With Maximum Displacement Adjustment Capacity
NOTE: This test must be performed outside in an area clear of any obstacles and personnel.
NOTE: Before performing the synchronization test the maximum displacement screws should be preset. Testing has shown that pre-setting the maximum and minimum displacement screws to the dimensions shown in illustrations (1) and (2) should result in both systems being synchronized.
Illustration 1:
Axle Motor.
Illustration 2:
Drum Motor. (E) 21 mm (.826 in). (F) Minimum adjustment screw. (G) Maximum adjustment screw. (H) 14 mm (.551 in).
Illustration 3:
Test port connections. (1) Drum Forwadr pressure tap. (2) Drum reverse pressure tap. (3) Axle forward pressure tap. (4) Axle reverse pressure tap.
1. Connect a 60,000 kPa (8700 psi) pressure gauge to drum forward tap (1), drum reverse pressure tap (2), axle forward pressure tap (3) and axle reverse pressure tap (4) (a total of four gauges).
NOTE: Mark each gauge to indicate which circuit it is measuring. Use extension hoses with enough length to read the gauges from the operator's seat.
2. Start and run the engine at high idle until the hydraulic system temperature reaches 38°C (100°F).
NOTE: The engine speed at high idle should be 2350 ± 50 rpm.
3. Move the speed selection switch to the LOW speed position.
4. Release the parking brake and move the propel lever FORWARD to a point approximately half-way between neutral and fill speed. Record the reading of the gauges connected to drum forward pressure tap (1) and axle forward pressure tap (3).
5. Move the propel lever in REVERSE to a point approximately half-way between neutral and full speed. Record the reading of the gauges connected to drum reverse pressure tap (2) and axle reverse pressure tap (4).
6. Move the speed selector switch to the HIGH speed position.
7. Release the parking brake and move the propel lever FORWARD to a point approximately half-way between neutral and full speed. Record the reading of the gauges connected to the drum forward pressure tap (1) and axle forward pressure tap (3).
8. Move the propel lever in REVERSE to a point approximately half-way between neutral and full speed. Record the reading of gauges connected to drum reverse pressure tap (2) and axle reverse pressure tap (4).
NOTE: The following values are shown for example only. The actual pressures will vary depending upon soil type and condition.
9. In the same direction and travel speed range, the pressure differential between the drum and axle motor circuits should be within 1375 kPa (200 psi). Perform the following procedures in accordance with the pressure readings.
Differential Pressure Is Greater Than 1375 kPa (200) PSI In BOTH Speed Ranges.
Remove Remove linkage (5) between the two manual displacement control levers (see illustration 3). Internal springs will hold each pump actuator lever in the neutral position. Adjust the length of the linkage so that both pump actuator levers remain in the neutral position when the rod is bolted in place.
Differential Pressure Is Greater Than 1375 kPa (200) PSI In LOW Speed Range Only.
Adjust the MAXIMUM displacement screw on the motor that has the lower system pressure. Turn the adjustment screw counter clockwise in one-half turn (180 degree) increments. This will decrease the differential pressure between the two motors. Repeat the adjustment procedure until the axle and drum motor pressure differential is within 1375 kPa (200 psi).
Differential Pressure Is Greater Than 1375 kPa (200 PSI) In The HIGH Speed Range Only.
Adjust the MINIMUM displacement screw on the motor that has the lower system pressure. Turn the adjustment screw clockwise in one-half turn (180 degree) increments.
System Pressure Is Low Or Zero For One Travel Direction.
System pressure in a given direction should be greater than the charge system pressure. If the pressure reading on one of the two pressure gauges is less than or equal to charge pressure, the pump may not be producing enough oil flow. In this situation, refer to the troubleshooting section of the Service Manual for more information.
Pressure Exists When Machine Is In NEUTRAL
Refer to the Service Manual for the procedure to set the neutral position of the pump swashplate.
10. When the differential pressure is less than 1375 kPa (200 psi) for each machine direction and travel speed.
NOTE: If major adjustments have been made to the motor displacement screws, perform the Travel Speed Test.
Travel Speed Test
1. Find a flat, smooth operating space that allows the machine to operate through a 30.5 meter (100 ft) distance.
2. Start and run the engine at high idle until the hydraulic system temperature reaches 38°C (100°F).
NOTE: The engine speed at high idle should be 2350 ± 50 rpm.
3. Measure the time required for the machine to travel through the 30.5 meter (100 ft) distance at top speed in each speed range.
4. Refer to the values below for the correct travel times. The travel times for forward and reverse in the same speed range should be within one second.
Low Speed range ... 14 - 16 seconds
High speed range ... 9 - 11 seconds