Troubleshooting Guide
Hydraulic Problems
Troubleshooting Guide
HD97doc041910
6-14
6
PROBLEM
CAUSE
SOLUTION
Hydraulic Toe Boards or
Clamp "Creep" DOWN with-
out the valve control han-
dles being operated OR do
not raise or lower at all.
Can be a result of shock load
caused by improperly using
the toe boards or clamp to
"cushion" or break the fall of
a cant onto the bed):
· damaged hoses
· damaged cylinder seals or
cylinder
· damaged valve
INITIAL CHECK
To check, disconnect the toe board
hydraulic hose from its current valve
section and temporarily connect it to
another valve section. Check to see if
the hydraulics operate properly.
If hydraulics operate properly,
hoses
and cylinder seals are good. Perform
further valve inspection, found below.
If down creep still occurs,
check all
hoses for possible pinholes causing
leakage. Replace if applicable. Retest.
If down creep still occurs,
replace
cylinder seals or cylinder and retest.
Be sure to reconnect the hose to the
proper valve section when done.
FURTHER VALVE INSPECTION
If further inspection of the valve is
required after initial check, remove the
check valve shown below. Flush the
check valve with an air hose or solvent
to remove any dirt from the valve's
seat. Reinstall and test again. Check to
see if the hydraulics operate properly.
If down creep still occurs,
replace
the check valve with a new one.
Retest.
If down creep still occurs,
replace the hydraulic valve.
Bad check valve (results in
one of the toe boards experi-
encing down-creep)
Check the release valve as instructed
above. If the release valve is good,
replace the high-pressure hydraulic
check valves (A12869) located on the
pump.
