4
Troubleshooting Quick Reference Guide for HYD-5 & HYD-10
(For further information please contact the factory)
WARNING! BEFORE PERFORMING ANY MAINTENANCE WORK ALWAYS ENSURE THAT THE DECK/FORKS ARE IN LOWER POSITION
Observation
Possible Cause
Remedy
1.)
Deck/forks do not raise.
2.)
Foot pedal goes down but deck/forks do not
raise.
3.)
Unit will pump under no load or when rapidly
stroked, or pedal will stroke without
pumping.
4.)
Deck/forks raise when the pump is stroked
but lower on return stroke.
5.)
Deck/forks raise but is too slow.
6.)
Spongy or jerky operation.
7.)
Deck/forks raise but do not lower.
a.
Excessive load.
b.
Oil is low.
c.
Relief valve set too low.
d.
Released pin is not rotating to closed
position.
e.
Breather cap is not allowing air into cylinder.
a.
Particle of dirt under the pressure relief
valve.
b.
Particle of dirt under inlet check valve.
a.
Pump is air locked.
b.
Inlet check valve has foreign material on
seat.
c.
Relief valve setting is out of adjustment.
d.
Foreign material on pressure relief valve
seat.
e.
Release pin has foreign material on the seat
or is stuck in the open position.
a.
Outlet check valve is leaking.
a.
Foreign material stuck under pressure relief
valve or under inlet check valve.
a.
Check for foreign material stuck in the deck
or frame rails.
b.
Oil is low.
a.
Foreign object blocking roller travel.
b.
Release pin is not rotating to open position.
a.
Remove part of the load.
b.
Fill oil as necessary.
c.
Increase only as necessary.
d.
Check linkage for proper rotation.
e.
Be sure cap has air hole. Clean cap out
with compressed air.
a.
Lower deck/forks - Remove and clean
steel ball and seat. (Refer figure 1)
b.
Lower deck/forks - Remove and clean inlet
ball and seat. (Refer figure 1)
a.
Bleed air from system inlet.
b.
Same as 2(b).
c.
Adjust relief valve setting higher.
d.
Same as 2(a).
e.
Lower deck/forks - Remove and clean
steel ball and seat. (Refer figure 1)
a.1. Lower deck/forks - Remove and clean
steel ball and seat. (Refer figure 1)
a.2. Pump vigorously to remove debris.
a.
Same as 2(a) / 2(b).
a.
Correct as necessary.
b.
Same as 1(b).
a.
Correct as necessary.
b.
Same as 1(d).
RELEASE PIN
STEEL BALL
STEEL BALL
SPRING
VALVE PLUG
STEEL BALL
SPRING
SPACER
SCREW
VALVE PLUG
STEEL BALL
SPRING
VALVE PLUG
(OUTLET CHECK VALVE)
(INLET CHECK VALVE)
(PRESSURE RELIEF VALVE)
FIGURE 1
