SkyTrak 6036 Service Manual - Manual (Page 182)

Section 9 Hydraulic System
9-32 Model 6036/6036T S/N 9B0500 thru 14833
Warning
Warning
Wait for the hydraulic fluid to cool before servic-
ing any hydraulic component. Hot hydraulic fluid
can cause severe burns.
3. Remove the transmission cover from the
frame.
4. Install a tee and pressure gauge capable of
measuring 0-4000 psi (275,6 bar) in the 15
gpm section outlet of the tandem pump, Fig.
9.7.
Warning
Before starting the engine be sure all hydraulic
connections are tight and all tools are removed
from the forklift.
5. Start the engine and allow it to idle (1000
rpm).
6. Turn the steering wheel fully left to right and
back (lock to lock) several times in all three
steering modes until they operate smoothly.
This should purge the steering system of air.
7. Increase engine speed to full throttle and
check the pressure gauge reading. It should
read between 610 and 660 psi (42 to 45,5
bar). If not, adjust the sequence valve by
turning the adjustment screw clockwise to
increase pressure or counterclockwise to
decrease pressure.
8. Turn the steering wheel completely left or right
and hold while checking the pressure gauge
reading. It should read 2850 ± 150 psi (196,4
± 10,3 bar). If not, adjust the steering relief
valve by turning the adjustment screw clock-
wise to increase relief pressure or counter
clockwise to decrease relief pressure.
9. Stop the engine and operate the steering
wheel after the engine has stopped to relieve
any trapped pressure.
10. Remove the pressure gauge and tee from the
tandem pump and reconnect the hydraulic
line.
11. Start the engine. Operate the steering wheel
several times to purge the system of air (step
6).
12. Install the transmission cover after adjustment
or repair.
3. The steer select valve solenoid is energized
and shifts the valve spool. Oil is channeled
through ports K to G to the base end of the
right rear steering cylinder and the rod end of
the left rear steering cylinder.
4. Return oil from each of the rear steering
cylinders flows through ports H to J of the
steer select valve to the rod end of the right
front steering cylinder and the base end of the
left front steering cylinder.
5. Return oil from each of the front steering
cylinders flows through ports A to E of the
power steering control valve to the return filter
in the reservoir.
b. Pressure Checks and Adjustments
1. Engage the park lock, place the travel select
lever in neutral, and stop the engine.
2. Operate the steering wheel after the engine
has stopped to relieve any trapped pressure.
Relieve hydraulic pressure before servicing any
hydraulic component. Escaping hydraulic fluid
under pressure can penetrate the skin causing
serious injury.
Center Position
When the auxiliary control lever is placed in the
center or neutral position, the directional control
valve spool is positioned so that supply pressure is
applied through ports D to A, Fig. 9.17, to the
return filter in reservoir. If the filter becomes
clogged, hydraulic oil will bypass the filter when
the pressure reaches 10 to 15 psi
(0,7 to 1,03 bar).
9.4.7 Optional Auxiliary Circuit
a. Description
Hydraulic pressure is applied in the optional
auxiliary circuit by the 15 gpm section of the
tandem pump, which draws its fluid through a
suction strainer in the reservoir, Fig. 9.17. Supply
pressure is directed to either a male or female
quick connect at the front of the boom by the
shifting of a spool in a directional control valve
found in the secondary control valve assembly.
The spool is shifted by an auxiliary control lever
and its associated control cable. The auxiliary
circuit supplies hydraulic pressure for use on
various hydraulically operated attachments.
Auxiliary control lever positions are as follows: