81
M2.0-1055-001
03 Rev. 9/09
HYDRAULIC
General Information
General Information
The hydraulic system in your truck is powered by a
gear type pump driven by either a DC motor or a three
phase AC motor. The pump, P1, supplies oil flow for
steering, lift and accessory functions.
Maximum pressure is limited by an adjustable relief
valve, RVM. The setting for RVM is noted on the hy-
draulic schematics. Refer to the service manual index
for pump, valve and manifold information.
AVOID HIGH PRESSURE FLUIDS-Escaping fluid un-
der pressure can penetrate the skin causing serious in-
jury. Relieve pressure before disconnecting hydraulic
lines. Tighten all connections before applying pres-
sure. Keep hands and body away from pin holes which
eject fluids under high pressure. Use a piece of card-
board or paper to search for leaks. Do not use your
hand.
Any fluid injected into the skin under high pressure
should be considered as a serious medical emergency
despite an initial normal appearance of the skin. There
is a delayed onset of pain, and serious tissue damage
may occur. Medical attention should be sought imme-
diately by a specialist who has had experience with this
type of injury.
Hydraulic Lines and Fittings
•
Blow air through all hose and lines to remove loose
particles before installing. Any rubber hose with
wire braid inner construction and any steel tube
lines which have been collapsed or kinked are per-
manently damaged and must be replaced even if
the damage is not externally visible.
• Flexible hose must be replaced if it collapses in
normal operating position.
• All hoses and lines are to be clear of any surface or
edge which will cause damaging wear and cuts, or
on which they can become caught.
• All connections are to be leak free.
Reservoir
With all cylinders in the retracted position and after all
air has been bled from the hydraulic system, fill reser-
voir so that the oil level is to the "FULL" mark on dip-
stick. The dipstick is located with the breather assem-
bly in reservoir. The capacity of the hydraulic reservoir
at this level should be approximately 16.6 liters
(4.4 gallons).
The hydraulic system is very susceptible to dirt and
contamination that could, over time, create hydraulic
malfunctions. Therefore, before adding oil to truck, fil-
ter oil with a 10 micron filter or with a 100 mesh strainer.
This is especially important when oil source is a
55 gallon drum.
Filter
Every 12 months or 2000 hours:
• Clean suction strainer (100 mesh strainer).
• Replace breather cap (includes 10 micron ele-
ment).
• Replace return filter (10 micron element).
When replacing return filter, do not tighten filter with the
use of a wrench. A wrench should only be used for filter
removal.
To install filter, apply a film of hydraulic oil to the seal
and hand tighten until seal contacts filter head. Then
tighten ½ revolution. Check for leaks.
Drift Test
All drift test should be conducted with a capacity load
(refer to serial plate for the rated capacity of your truck).
The material used for the test load must be evenly
stacked within the limits of a four foot square pallet and
must be secured to the fork carriage with forks spread
to their maximum width.
Lift measurement is to be taken from the tip of the fork
to the floor.
Never stand or work under a suspended load.
Crown 2007 PF15675-1 Rev. 9/09
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