SkyTrak 6036 Service Manual - Manual (Page 133)

Section 9. Hydraulic System
Model 6036 S/N 9B0499 and Before 9-20
4. Return oil from each of the front steering
cylinders passes through the solenoid-ener-
gized select steer valve from ports I to G to the
extend side of the right rear steering cylin-
der and the retract side of the left rear
steering cylinder.
5. Return oil from each of the rear steering
cylinders flows through select steer valve ports
H to J and power steering control valve
section ports D to E to the return filter and
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.
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.
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.
Warning !
Warning !
Warning !
Wait for the hydraulic fluid to cool before servic-
ing any hydraulic component. Hot hydraulic fluid
can cause severe burns.
7. Increase engine speed to full throttle and
check the pressure gauge reading. It should
read between 575 ± 25 psi (39,6 ± 1,7 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 2475 ± 25 psi (170,5
±1,7 bar). If not, adjust the steering relief valve
by turning the adjustment screw clockwise to
increase relief pressure or counterclockwise to
decrease relief pressure.
9. Stop the engine and operate the steering
wheel after the engine has stopped to relieve
any trapped pressure.
10. Place the ignition switch in RUN position so
that steering and emergency brake pump will
run. Check the pressure gauge reading
(output of pump). Pressure should be 1500
psi minimum.
11. Turn off the ignition. Repeat step 2.
12. If the steering or emergency pump does not
work properly, locate the cause of the problem
and correct before putting the vehicle into
service.
13. Remove the pressure gauge and tee from the
tandem pump and reconnect the hydraulic
line.
14. Start the engine. Operate the steering wheel
several times to purge the system of air (step
6).
15. Install the transmission cover after adjustment
or repair.
9.1.7 Optional Auxiliary Circuit
a. Description
Hydraulic pressure is applied in the optional
auxiliary circuit by the 30 gpm section of the
tandem pump, which draws its fluid through a
suction strainer in the reservoir, Fig. 9.8. 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 main 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:
Before starting the engine be sure all hydraulic
connections are tight and all tools are removed
from the forklift.
Relieve hydraulic pressure before servicing any
hydraulic component. Escaping hydraulic fluid
under pressure can penetrate the skin causing
serious injury.