OWNER / OPERATOR MANUAL
LeakProof III
9
DOC06436 Rev B
5.0 Troubleshooting
5.1 Switching Valve
Unloading
Problem:
Floor does not run at all.
Check: All items on START-UP check list. (See Start-Up check list, above.)
Problem:
Cycle starts then floor stops.
Specific trouble: Driver’s side cylinder (#1) extends toward the front of the trailer, center cylinder (#2)
extends toward the front of the trailer, passenger side cylinder extends toward the front of the trailer;
then the system stops.
Solution: The (#6) check valve has malfunctioned. Replace the check valve.
Specific trouble: All three cylinders retract toward the rear of the trailer; then the system stops.
Solution: The (#1) check valve has malfunctioned. Replace the check valve.
Note:
If floor stops in the full rear position and the switching valve has switched, you may not have
enough oil pressure. Less pressure is required to move the load than to pull the slats 1/3 at a time under
the load.
5.2 Check Valve
Unloading
Problem:
Does not cycle correctly.
1. Specific trouble: Cylinders (#1) and (#2) extend together toward the front of the trailer while
unloading.
Solution: The check valve at the forward end of the cylinder (#1) has malfunctioned. Replace the check
valve.
2. Specific trouble: Cylinders (#2) and (#3) extend together toward the front of the trailer while
unloading.
Solution: The check valve at the forward end of the cylinder (#2) has malfunctioned. Replace the check
valve.
3. Specific trouble: All cylinders extend together toward the front while unloading.
Solution: The control valve is bypassing or the check valves at the front of the (#1) & (#2) cylinders have
malfunctioned. First replace the control valve. Then if the problem persists, replace the check valves.
