Group Ill. Drive Train; Troubleshooting Guide - Bolens QS Series Service Manual

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GROUP Ill: DRIVE TRAIN
QS, QT
&
1900 SERIES
Page 3·1 REV. 12/78
TROUBLE SHOOTING GUIDE
PROBLEM PROBABLE CAUSE
REMEDY
Unit will not operate in either 1. Free wheeling valve open 1 . Close valve
forward or reverse
(Sundstrand Hydro models)
2.
System low on oil 2.
Refill to proper level
3.
Plugged oil filter 3. Replace filter
4.
Faulty control linkage
4.
Check linkage, correct problem
5.
Hydro input shaft not turning
5.
Check input shaft key, replace
if necessary
6.
Hydro unit not functioning
6.
Repair or replace hydro
Unit will operate in one
1 . Faulty control linkage 1. Check linkage, correct
direction only
problem
2. One check valve stuck open 2.
Remove and inspect, clean
or replace if needed
Loss of power
1 . Low on oil
1 . Check and add as necessary
2. Free wheeling valve partially
2. Close valve
open (Sundstrand Hydro
models)
3. Filter or suction line 3. Replace filter, clean and
clogged refill system
4.
Worn linkage
4.
Replace or adjust
5. Air in system
5.
Refill and .check for leaks
6.
Engine lugs down
6.
Check engine for proper
power level
Unit operating hot
1.
Oil level low
1 . Check for leaks and refill
to proper level
2. Dirt on transmission
2.
Clean external surtace
3. Excessive load or high drawbar 3. Reduce load or drawbar
loading loading
4. Fan not turning
4.
Check fan for proper
operation
5. Partially plugged filter
5.
Replace filter and oil
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6. Internal damage to hydro 6. Repair or replace hydro