HYDRAULIC
General Information
82
M2.0-1055-002
03 Rev. 9/09
Lift Drift Test
Place maximum load (refer to serial plate for rated ca-
pacity of your truck) on forks at rated load center, and
mast tilted back. Elevate the test load above staging
height. Shut off truck. After five minutes, measure the
distance the forks have drifted. Load drift downward
may not exceed 64 mm (2.5 in) over a five minute pe-
riod.
Tilt Drift Test
Cycle tilt forward and back several times before testing.
Place maximum load at rated load center and elevate
load above staged height. With the mast at vertical
(0 in), the mast and carriage may not drift more than
19.05 mm (0.75 in) during a five minute period, mea-
sured at the tilt cylinder rod.
Steering Slip
With truck keyed up, stand or place weight on the ped-
als and turn the tiller into the stop and hold it against the
stop with 128.8-162.7 Nm (95-120 ft lb) steer force.
Check steer tiller speed for CW and CCW directions,
movement is not to exceed 10 rpm on trucks equipped
with standard oil and 20 rpm on trucks equipped with
freezer oil. If the movement exceeds these ratings, a
need for corrective action as indicated.
Freezer Preparation
Crown trucks may require a mixture of low temperature
hydraulic oil, Crown P/N 363505-101 (3.78 liters
[1 gal]), blended 50% with standard hydraulic oil,
Crown P/N 363504-101 (3.78 liters [1 gal]) when used
in a freezer or cooler. High concentrations of low tem-
perature oil is too thin for most cold storage operations
and therefore could shorten the life of the pump and
cylinder packings if used in higher ambient tempera-
tures.
Trucks equipped with velocity fuses may experience
staging issues if an insufficient mix of low temperature
oil has been used.
For truck applications operating continually in temper-
atures at or above 4.4° C (40° F), use 100% standard
hydraulic oil (363504-101) (1). Refer to Figure 16063.
For truck applications operating continually in temper-
atures in a cool environment with freezer use, a 50/50
blend of low temperature (363505-101) and standard
hydraulic oil (363504-101) (2) should be used.
The proper mixture of freezer hydraulic oil will ensure
the best and most efficient operation of your Crown
equipment.
Circuit Operation
The following information contains brief descriptions of
the hydraulic circuits for the various hydraulic func-
tions. Figure 14161 is a reference schematic for these
descriptions and may vary for that which is applicable
to your truck. Refer to hydraulic schematic in the HYD
section of this manual for the schematic of your unit.
Figure 22422
100% Standard
Hydraulic Oil
50/50 Mix of Standard
and Low-Temp
Hydraulic Oil
Crown 2007 PF15675-2 Rev. 9/09
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