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CHAPTER 5. HYDROSTATIC TRANSMISSION
Trouble Presumable cause Countermeasure
4. Insufficient delivery of charge When cold: Warm up sufficiently.
pump due to abnormal oil When hot: Stop the engine and wait
temperature until the machine cools down.
Then start.
HST produces abnormal noise. 1. Air is trapped within the HST Check suction piping of the charge
system pump and oil level in the tank. (After
correction, bleed the HST system of
air.)
2. Decreased circuit flow caused Clean a clogged filter or stariner.
by a clogged filter or strainer
3. Insufficient delivery of charge When cold: Warm it up sufficiently.
pump due to abnormal oil When hot: Stop the engine and wait
temperature until the machine cools down.
Then start.
4. Loosened or worn linkage of Adjust or repair the linkage.
the machine
5. Erratic operation of the HST unit Wash the hydraulic circuit of the ma-
due to defective inner parts or chine thoroughly, repair the coupling
defective coupling of input or and replace the HST unit assembly
output shaft with a new one.
The control lever is very slow 1. Worn slant board bearing Replace the worn bearing with a
to return or is very heavy to new one.
operate
2. Worn, damaged, or dirty friction- Correct the frictioning part or replace
ning part of the stant board a defective part with a new one.
bearing
Oil is leaking through a shaft 1. Defective or broken oil seal or Damaged or defective oil seal or
or oil seal. O-ring O-ring should be replaced with a
new one. When installing an oil seal,
take care not to damage the lips of
the oil seal.
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