Clark GEX20 - Hydraulic Fluid and Filter Change; Remove, Clean and Replace the Strainer

Group 29, Hydraulic Sump, Filters, and Pump
SM 765, Nov ’06 Main Hydraulic Sump, Filters, and Pump Specifications and Description • 29-1-5
Hydraulic Fluid and Filter Change
CAUTION
!
SAFE PARKING. Before working on truck:
1. Park truck on a hard, level, and solid
surface, such as a concrete floor with no
gaps or breaks.
2. Put upright in vertical position and fully
lower the forks or attachment.
3. Put all controls in neutral. Turn key
switch OFF and remove key.
4. Apply the parking brake and block the
wheels.
There is drain plug in the hydraulic sump tank. When the
sump tank must be drained of all fluid, the procedure is to
remove the drain plug and allow the fluid to drain into a
suitable drain pan. Unless the sump tank is to be removed
for other repair or maintenance, the hydraulic fluid can
also be changed by one of the following methods:
Pressure gauge to the diagnostic check port fitting.
NOTE: Use quick-disconnect adapter fitting.
You will need a drain pan of 24 L (6.3 gal) minimum
capacity. Be sure the outlet end of the drain line is directed
into the drain pan and held from moving when pressur-
ized.
Turn key switch ON.
Move tilt control lever to the back tilt position to start the
lift pump. Hold tilt lever in this position until sump tank is
emptied. A steady stream of used oil should flow from the
drain line.
Continue operation until the sump tank is emptied. This
point will be reached when the pump starts to cavitate.
When cavitation occurs the pump speed will increase and
the speed sound will whine. Release the tilt lever immedi-
ately when pump cavitation occurs.
IMP
O
RTANT
Be careful when sump is nearly emptied and
oil flow becomes erratic as the pump
approaches cavitation Do not operate pump
after cavitation occurs.
Turn the key switch OFF.
Disconnect drain line from truck.
N
O
TI
C
EN
O
TI
C
E
If old oil is excessively dirty or hydraulic sys-
tem is contaminated, it is recommended that
the sump tank be completely drained by
removing the pump suction line from the
sump outlet and flushed withy clean oil.
Remove, clean and replace the strainer.
Remove and discard old oil filter. Install new filter. Follow
the installation instructions printed on the filter body.