Drum Drive Motor
(1) Brake line. (2) Case drain line.
Remove brake line (1) from the drum drive motor. Plug
the brake line and cap the fittings.
Install the 4C-6500 Digital Thermometer into the
hydraulic oil tank. The hydraulic oil temperature must
be 38C (100F) for proper test results.
Disconnect case drain line (2) from the drum drive
motor. Install 9X-2350 Hose and 4C-8689 Flow Meter
to the drum drive motor. This allows the leakage oil to
flow from the drive motor through the flow meter and
into case drain line (2).
Install two 51710 kPa (7500 psi) pressure gauges on
the pressure test ports for the drum propel pump.
To prevent overheating of the hydraulic oil and damage to
the propulsion system components, do not run each test
longer than 30 seconds.
Start the engine. Run the engine at high idle.
Set the speed range switch to the HIGH SPEED
With the propel control lever in NEUTRAL position, read
the amount of oil that is flowing through the flow meter.
The oil flow should be less than 1 gpm.
Release the parking brake.
Slowly move the propel control lever in the FORWARD
position. When the pressure reaches 10342 kPa (1500
psi), the maximum allowable oil flow is 3.8 gpm.
Repeat Step 9 four times. Rotate the drum for
90 after each reading.
Repeat Steps 7 through 9 while the propel control lever
is in REVERSE position.
If the leakage is more than 3.8 gpm, the drum drive
motor and/or the flushing valve should be repaired or
Remove the caps and the plugs. Reconnect brake line
(1) to the drum motor.
Piston Motor Case Leakage (Axle Propel) - Test
SMCS Code: 4351-Q81-FW
Hose (36 inches)
Personal Injury or death can result from sudden machine
Sudden movement of the machine can cause injury to
persons on or near the machine.
To prevent injury or death, make sure that the area around
the machine is clear of personnel and obstructions before
operating the machine.