TESTING AND ADJUSTING
Use this is a reference for the location and cor-
rection of problems in the power train. When more
checking is necessary, use the 7S8875 or 8M2736
Hydraulic Test Box. Locations of the pressure
taps, and procedures for testing and adjusting are
given in POWER SHIFT TRANSMISSION TEST-
ING AND ADJUSTING, Chapter 2, Part One.
Always make visual checks first. Then check the
operation of the machine and go on to check with
1. Check the oil level in the transmission.
2. Check all oil lines, hoses and connections for
leaks and damage. Look for oil on the ground
under the machine.
3. Move the control lever to all REVERSE and
all FORWARD positions. The detents must be
felt in all positions.
4. Let the oil out of both screen housings.
Remove and check the screens for loose
Paper particles give the indication of a
direction clutch failure.
Bronze particles give the indication of a
speed clutch failure.
Shiny steel particles give the indication of
a pump failure.
Rubber particles give the indication of a
rubber seal or hose failure.
If you find paper, bronze, rubber, or steel
particles, all components of the hydraulic systems
must be washed clean. Do not use parts with
damage. Use new parts.
CHECKS DURING OPERATION
With the engine running, move the selector lever
to all speed positions. The detents must be felt in
Operate the machine in each direction and in all
speeds. Make note of all noises that are not normal
and find their sources. If the operation is not
correct, make reference to the CHECK LIST
DURING OPERATION for problems and prob-
CHECK LIST DURING OPERATION
PROBLEM: Transmission does not operate in any speed or
does not engage (slips) in all speeds.
1. Low oil pressure caused by:
Low oil level.
Control linkage loose or adjustment not
Failure of the oil pump or the pump
Air leaks on inlet side of pump.
Leakage inside the transmission.
Adjustment of the modulating relief valve
not correct, or valve does not close.
Load piston not closing.
2. Mechanical failure in transmission.
3. Failure of the differential.
4. Failure of the final drive planetaries.
PROBLEM: Transmission does not shift.
1. Low oil pressure.
2. Air leaks on inlet side of pump.
3. Control cable loose or adjustment not correct.
PROBLEM: Transmission engages very suddenly (rough
1. Primary setting of the relief valve not correct.
2. Adjustment of control linkage not correct.
3. Load piston not closing.
4. Valve springs that are weak or have damage.
PROBLEM: Slow shifting.
1. Low oil pressure.
2. Inside and outside linkage adjustment not
3. Air leaks on inlet side of pump.
4. Load piston not closing.