Troubleshooting Guide
Hydraulic Problems
6
6-5
HDdoc072619
Troubleshooting Guide
Low air temperature caus-
ing fluid to thicken
Allow fluid to warm up. Synthetic fluids are
available that allow for hydraulic operation
in cold weather conditions (Univis HVI 13)
Hydraulic Turner Goes Up
Before Or At Same Time
As Side Supports
Dirt in sequence valve
Remove sequence valves and clean thor-
oughly with kerosene.
NOTE:
Be sure to
reassemble the valve and install it in its
original position on the cylinder
Retainer in sequence
valve worn
Replace sequence valve
Low air temperature caus-
ing fluid to thicken
Allow fluid to warm up. Synthetic fluids are
available that allow for hydraulic operation
in cold weather conditions. (Univis HVI 13)
Hydraulic Toe Boards
"Creep" UP OR DOWN
without the valve control
handles being operated
OR do not raise or lower
at all..
Can be a result of shock
load caused by improperly
using the toe boards to
"cushion" or break the fall
of a cant onto the bed):
ꞏ damaged hoses
ꞏ damaged cylinder seals
or cylinder
ꞏ damaged valve
INITIAL CHECK
To check, disconnect the toe board hydrau-
lic hose from its current valve section and
temporarily connect it to another valve sec-
tion. 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 creep still occurs,
check all hoses for
possible pinholes causing leakage. Replace
if applicable. Retest.
If 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 prop-
erly.
If creep still occurs,
replace the check
valve with a new one. Retest.
If creep still
occurs,
replace the hydraulic valve.
PROBLEM
CAUSE
SOLUTION