DRESSTA TD-25M EXTRA - Drive Train Clutch Test

DRIVE TRAIN SECTION 7
Page 23
DRESSTA TD-25M EXTRA
SERVICE DIAGNOSIS
12. DRIVE TRAIN CLUTCH TEST
NOTE: Before performing the drive train clutch test, the drive train oil pressures should be
checked. Refer to Par. 10, TRANSMISSION AND TORQUE CONVERTER OIL PRESSURE TEST
and to Par. 13, STEERING SYSTEM OIL PRESSURE CHECK in this Section.
WARNING! Be sure the area around the machine is clear of personnel and
obstructions as the machine may move during this test. If the machine starts to
move, fully depress the decelerator pedal and shift the transmission to NEUTRAL.
Do not hold the machine in a stall condition for more than ten seconds after the
pointer of the converter oil temperature gauge is within the RUN range.
1. Apply the brake pedal and lock it. Remove the front center floor plate in the operator’s platform.
2. Start the engine. Place the engine speed control lever in the high idle position and depress
the decelerator pedal to decrease the engine speed. Move the drive train neutral lock lever to
the OFF position.
3.
Shift the drive train control lever into forward second gear range with the steering drive in the
high range and in low range clutch engagement position; gradually release the decelerator
pedal and check for drive shaft rotation. With the engine running at high idle, shift the
transmission into forward third gear range and again, check for drive shaft and final drive
sprocket rotation.
4. Fully depress the decelerator pedal and shift the transmission into reverse third gear range.
Gradually release the decelerator pedal and again, check for drive shaft and final drive sprocket
rotation.
5. Fully depress the decelerator pedal and shift transmission into neutral. Move the drive train
neutral lock lever to the ON position. Place the engine speed control lever in the low idle
position and release the decelerator pedal. Stop the engine.
6. If the drive shaft and final drive sprocket did NOT rotate, the operational condition of the drive
train clutches is satisfactory, with the possible exception of a slipping first gear range clutch in
the transmission.
7. If the drive shaft and/or final drive sprocket did rotate, refer to the following diagnostic chart.
8. Reinstall the front center floor plate in the operator’s platform.
Drive Train Clutch Diagnostic Chart
PROBLEM PROBABLE CAUSE
1. Final drive sprocket stationary and drive shaft turns
in all transmission gear ranges in LO or HI range
Slipping LO or HI drive clutches in
steering drive.
2. Final drive sprocket stationary and drive shaft turns
in forward and reverse second gear range only
Slipping second gear range clutch in
transmission.
3. Final drive sprocket stationary and drive shaft turns
in forward and reverse third gear ranges
Slipping third gear range clutch in
transmission.
4. Final drive sprocket stationary and drive shaft turns
in forward third gear range but not in reverse third
Slipping forward directional clutch in
transmission.
5. Final drive sprocket stationary and drive shaft turns
in reverse third gear range but not in forward third
Slipping reverse directional clutch in
transmission.
6. Final drive sprocket rotates Slipping brake clutch in steering drive.