TM 5-3820-245-14&P
5-2
FUNK TRANSMISSION TROUBLE SHOOTING
A.
Diagnosing Problem
The diagnosis of trouble in the transmission always should start by making certain preliminary checks before
it is assumed that the transmission is at fault, or before carrying out any other trouble shooting procedures.
1.
Check the coolant level in engine radiator.
2.
Check the oil level in transmission. A low oil level can affect the operation of the transmission, and
may indicate fluid leaks that could cause transmission damage. A high level can cause foaming of the
oil which, in turn, may result in clutch slippage or leakage at the breather or filler tube.
3.
Check the oil pressure gauge on instrument panel. This should be as described under "OPERATION"
on the previous page.
4.
Check the oil temperature gauge on instrument panel. This should never exceed 250F.
5.
Check the adjustment of the control and governor linkages. Make sure that the engine starts to rev up
immediately after the pedal or lever leaves the neutral zone, and that the governor is being held wide
open with pedal or lever in the full throttle position. All interference's that limit top R.P.M. should be
remedied.
The linkage rod from the shuttle control box to the valve lever must be adjusted so that equal tension
or pressure is applied to the spring on top of the valve lever. This is to insure that the valve is always
open to its fullest extent in either direction.
If the unit starts with a jerk, check the engine idle speed which is recommended at 1200 R.P.M. If idle
speed is lower than this, unit will die too easily in rapid reversals; and if higher than this, the converter
will transmit too much torque for smooth starts. Any external interference's in the control linkages that
enables the engine to accelerate prior to clutch engagement must be eliminated if smooth starts are to
be expected.
6.
Upon complaint of engine-transmission performance, first check the engine to see if it is performing
satisfactory.
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