SkyTrak 6036 Service Manual - Manual (Page 126)

Section 9. Hydraulic System
9-13 Model 6036 S/N 9B0499 and Before
2. Operate the hydraulic controls 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) at the 30
gpm section outlet of the tandem pump, Fig.
9.5.
5. Start the engine. Operate the frame tilt control
several times to purge the system of air.
6. Allow engine to run at idle. Place the fork and
frame control lever in the “right” position and
hold until the frame tilt cylinder bottoms out.
Continue holding the lever in the “right”
position until the pressure readings are taken.
7. Check the pressure gauge reading. It should
read 1200 ± 50 psi (82,7 ± 3,4 bar). If not,
adjust the frame tilt “right” relief valve, Fig. 9.2,
Warning !
Warning !
turning the adjustment screw clockwise to
increase pressure or counterclockwise to
decrease pressure. Torque nuts on relief
valve to 10 ± 1.5 lb-ft (13,5 ± 2 N m) after
adjustment.
8. Stop the engine. Operate the hydraulic
controls after the engine has stopped to
relieve any trapped pressure.
9. Remove the pressure gauge and tee from the
tandem pump and reconnect the hydraulic
line.
10. Start the engine. Operate the frame tilt control
fully several times to purge the system of air.
11. Install the transmission cover after adjustment.
c. Testing
The frame tilt circuit should be tested whenever
repairs or adjustments are made to components of
the circuit :
1. Start the engine, park the forklift on level
ground and level the frame.
2. Check for signs of leakage of hydraulic oil
from circuit hoses and other components.
Correct any leakage problem before testing.
3. Operate the frame tilt control several times to
purge the system of air if necessary.
4. Starting with the frame tilted fully to the left, tilt
the frame fully to the right at full engine speed.
The time required for frame tilt right should be
8 to 12 seconds (no load).
5. Starting with the frame tilted fully to the right,
tilt the frame fully to the left at full engine
speed. The time required for frame tilt left
should be 7 to 11 seconds (no load).
6. Repeat steps 4 and 5 to check performance.
7. If the frame tilt test does not meet perform-
ance requirements, locate the cause of the
problem and correct before putting the vehicle
into service.
Wait for the hydraulic fluid to cool before servic-
ing any hydraulic component. Hot hydraulic fluid
can cause severe burns.
Before starting the engine be sure all hydraulic
connections are tight and all tools are removed
from the forklift.
Warning !
Relieve hydraulic pressure before servicing any
hydraulic component. Escaping hydraulic fluid
under pressure can penetrate the skin causing
serious injury.