
Troubleshooting Guide
Hydraulic Problems
Troubleshooting Guide
HDdoc072619
6-6
6
You Can Get Response
From the Pump By Actuat-
ing All But One or Two
Handles
Valve assembly switch
contacts are not properly
adjusted
Locate the valve switch at the bottom of the
valve assembly. Use a 3MM allen wrench to
loosen the set screw on each of the five
switch contacts. Press each contact to the
valve block and tighten the contact set
screw to secure in place.
CAUTION!
Do not
overtighten!
NOTE:
Do not adjust the valve switch or
switch spring; they have been preset at the
factory.
Pump Motor Runs With
Little Or No Response
From The Cylinders
Low battery
Test battery. Recharge or replace as neces-
sary
Low fluid level
Check fluid level. Add an all-season
hydraulic fluid such as Amoco Rycon Oil
MV or Mobil Multipurpose ATF (automatic
transmission fluid)
until level is 4 - 4 1/2" (100 - 114mm) from
bottom of reservoir with all cylinders
retracted
Pressure relief valve
moved from proper setting
Adjust pressure relief 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)
Pump Motor Runs Contin-
uously When Power Con-
tact Is Made
Solenoid is stuck closed
Tapping the solenoid may solve this prob-
lem temporarily. Replace solenoid
Fluid Leaks From Around
Cylinder Piston Ram
Worn seals
Replace seals in cylinder. Check piston ram
for abrasive weld that may be causing pre-
mature seal failure
Fluid Leak Around Pump
Box
Loose seal or fitting
Wipe pump off completely to locate cause
of leak. You may have to unbolt the pump to
wipe behind it.
NOTE:
Movement of the
sawmill can cause fluid to slosh up into the
foam filter in the reservoir cap, and subse-
quently spray out, giving the appearance
that fluid is leaking from the pump
Hydraulic Side Supports
Go Down Before Or At
Same Time As Log Turner
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
PROBLEM
CAUSE
SOLUTION