Testing the Hydraulic Flow of the Piston Motors (Propel)
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Do not operate or work on this machine unless you have read and understand the instructions and warnings in the Operation and Maintenance Manual. Failure to follow the instructions or heed the warnings could result in injury or death. Contact any AVSpare dealer for replacement manuals. Proper care is your responsibility. |
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Introduction
The flow test for the piston motor (propel) will measure the hydraulic oil flow rate in order to determine if the motor is operating within the desired parameters. The piston motors (propel) have a fixed displacement. The propel motors cannot be adjusted in order to vary torque or motor speed. Ensure that the ECM is calibrated to reflect operator settings and default factory settings for the propel system.
Required Tools
Hydraulic test procedures may be performed using either one of the following test equipment:
- AVSpare DataView
- Standard Dual Flow Meter
AVSpare DataView Tool
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| Illustration 1 | g00920192 |
AVSpare DataView AVSpare DataView is a PC based diagnostic tool. The AVSpare DataView accepts a maximum of nine standard AVSpare sensors for measurements on the machine. The signal is transmitted to a personal computer and the information is displayed. | |
The following table provides a list of the required tools if AVSpare DataView is used in order to perform the following test procedure. AVSpare DataView is not shown in the following test procedure.
| Required Tools | |
| Part Number and Description | Quantity |
| 131-5051 DataView Tool Gp | 1 |
| 131-5056 Adapter Cable | 1 |
| 4C-9911 Flow Meter Gp 7.6 to 45 L/min (2 to 12 US gpm) |
1 |
Standard Tools
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| Illustration 2 | g00944528 |
Flow meter and hose | |
| Required Tools | |||
| Tool | Item | Part Number and Description | Quantity |
| A | A1 | 6V-7788 Flow Meter Gp 0 to 57 L/min (0 to 15 US gpm) |
1 |
| A2 | 122-6891 Hose Minimum Length of 762 mm (2.5 ft) |
1 | |
Test Procedure
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Sudden movement of the machine or release of oil under pressure can cause serious injury to persons on or near the machine. To prevent possible injury, perform the procedure that follows before testing and adjusting the hydraulic system. |
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Perform the following procedure before you perform the test procedure that follows:
- Shut off the engine.
- Park the machine on a level area that is clear from all equipment and material.
- Verify that the service brake system and the parking brake system are in good working order.
- Apply the parking brake.
- Ensure the propel lever is the NEUTRAL position.
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| Illustration 3 | g00983792 |
The piston motors (propel) are located on the rear of the final drive planetaries. | |
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| Illustration 4 | g00929890 |
Note: There are two identical propel motors on the machine. One motor is for the right propel and one motor is for the left propel. Perform this test on both of the propel motors. The left propel motor will be tested in this procedure.
- Disconnect return line (5) from cooler bypass valve (1) at connector (4) .
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| Illustration 5 | g00929822 |
(1) Cooler bypass valve (2) Port "C" for the inlet into the left propel motor (3) Port "B" for the inlet into the right propel motor | |
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| Illustration 6 | g00930282 |
(2) Port "C" for the inlet of the left propel motor (4) Connector (5) Supply line from left propel motor | |
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Hot oil and components can cause personal injury. Do not allow hot oil or components to contact skin. |
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- Connect return line (5) to 6V-7788 Flow Meter Gp (A1) .
- Assemble one end of 122-6891 Hose (A2) to the end of 6V-7788 Flow Meter Gp (A1) .
- Assemble the other end of 122-6891 Hose (A2) to port "C" (2) .
- Ensure that all of the connections are secure.
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| Illustration 7 | g00993040 |
Top View of the Machine (1) Cooler bypass valve (2) "Port C" inlet for left propel motor (4) Connector for "Port C" (5) Return line from left propel motor | |
- Ensure that the parking brake control is in the DISENGAGED position. Ensure the propel lever is in the NEUTRAL position.
Note: This test will not require the use of an assistant. Ensure that the flow meter is fixed to the machine. The flow meter should be mounted above the engine compartment. The flow meter should always be in clear view of the operator.
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| Illustration 8 | g00930287 |
Operator Console (6) Throttle control switch (7) High idle position (8) "PAVE" mode (9) Speed control switch (10) Speed dial potentiometer (11) Propel lever | |
- Start the engine. Place throttle control switch (6) in high idle position (7) .
- Place speed control switch (9) in "PAVE" mode (8) .
- Turn speed dial potentiometer (10) clockwise to the maximum position.
- Ensure that the machine is in an open area. Ensure that the machine is clear of all personnel and equipment.
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Sudden movement of the machine or release of oil under pressure can cause serious injury to persons on or near the machine. To prevent possible injury, perform the procedure that follows before testing and adjusting the hydraulic system. |
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- Slowly move propel lever (11) to the full FORWARD position. The propel pump will be at full stroke as the machine propels forward. Hydraulic oil flow to the propel motor is at the maximum flow rate.
- In the FORWARD position, flow meter (A1) should read 11 ± 1.9 L/min (2.9 ± 0.5 US gpm).
- Slowly move propel lever (11) to the NEUTRAL position.
- In the NEUTRAL position, the flow meter should read zero.
- Slowly move propel lever (11) to the full REVERSE position. The propel pump will be at full stroke as the machine starts rearward travel. Hydraulic oil flow to the propel motor is at the maximum flow rate.
- In the REVERSE position, flow meter (A1) should read 11 ± 1.9 L/min (2.9 ± 0.5 US gpm).
- If the readings are not within these limits, refer to Troubleshooting Manual, KENR5036, "Electrical and Hydraulic Systems" for a possible solution.
- Stop the engine.
- Observe the machine and the operating temperature. Fifteen minutes should pass before you attempt to proceed to the next step. This will allow the temperature of the machine to lower.
- Disconnect 6V-7788 Flow Meter Gp (A2). Disconnect return line (5) from 6V-7788 Flow Meter Gp (A2). Remove 122-6891 Hose (A2) from Port "C".
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| Illustration 9 | g00993040 |
Top View of the Machine (1) Cooler bypass valve (2) "Port C" inlet for left propel motor (4) Connector for "Port C" (5) Return line from left propel motor | |
- Reconnect return line (5) to Port "C" on cooler bypass valve (1) .
- Repeat this entire test procedure for the right propel motor.