Thomas 85 - Page 43

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4. 11A Electrical (Cont’d)
4 MAINTENANCE
Problem Cause Remedy
Check and correct
Check and correct
Check and correct
Defective fuel
solenoid switch
Burnt fuse 15A
Loose or faulty
connection
Engine will not
stop when the key
is turned OFF
Problem Cause Remedy
Replenish with 10W30
API SE/CD oil
Check for hose or
fitting leak
Reconnect and adjust
linkage
Replace. Check pintle
lever for loose bolt or
excessive play
Replace line. Ensure
new line fits without
being forced. If
necessary stress relieve
Replace chain or
connection link
Inspect and repair
defective parts. Check
motor mounting bolts
Replace parts as
necessary
Inspect and repair
defective unit. Flush all
lines and tank. Replace
filter. Check on type of
filter used and engine
RPM
Replace defective valve
Disassemble and repair
Replenish with 10W30
API SE/CD oil
Check for hose or
fitting leak
Reservoir low on oil
Disconnected
control linkage
Groove pin sheared
on pump pintle lever
High pressure line
failure
Drive chain failure
Motor shaft or key
failure
Charge pressure
failure
Excessive internal
leakage in pump
and/or motor
Defective relief
valve
Damaged ball check
Reservoir low on
fluid
No power on one
side (Both
directions)
Power may appear
to be lost on one
side only initially,
but after a few
minutes running ,
will be lost on both
sides
No power on one
side (one direction
only)
No power on both
sides (also loss of
hydraulic power)
4. 11B Hydrostatic Drive
Problem Cause Remedy
Inspect and repair
damaged parts. Check
for misalignment
between engine and
pumps
Inspect coupling for
sheared spines -
replace. Also check
support bearings in
pump.
Replenish with 10W30
SE/CD oil. Check for
hose or fitting leak.
Check hydraulic oil
level, check charge
pressure relief valve
Pressure must be
minimum 110 PSI
Inspect and repair
defective unit. Flush all
lines and tank, change
filter. Check on type of
fluid used and engine
RPM
Disassemble and repair
Inspect and repair
defective unit. Flush all
lines and tank, change
filter. Check on type of
fluid used and engine
RPM Replenish with
10W30 SE/CD oil.
Replenish with 10W30
SE/CD oil.
Check fittings and
tighten
Inspect and repair
defective unit. Flush all
lines, tanks and change
filter. Check type of
fluid used and engine
RPM
Adjust linkage and
tighten or replace pintle
lever.
Check that shields are
not stopping lever from
full travel. Check for
linkage binding at
spring mount.
Universal joint
failure between
engine and pump
Drive coupling
between front and
rear pump failure
Reservoir low on oil
Charge pump failure
Excessive internal
leakage in pump
and/or motor
Damaged ball check
Excessive internal
leakage in pump
and/or motor
Air in system due to
low oil level in
reservoir
Air in system due to
leak at suction
fitting
Internal pump or
motor wear caused
by overspeeding
Excessive play in
linkage or pintle
lever
Control levers
binding improper
adjustment
No power on both
sides (also loss of
hydraulic power)
No power on both
sides (full
hydraulic power)
Gradual loss of
power as machine
warms up
System erratic
and/or noisy
Machine will not
travel in a straight
line in high range