SkyTrak 6036 Service Manual - Manual (Page 123)

Section 9. Hydraulic System
Model 6036 S/N 9B0499 and Before 9-10
5. Start the engine. Operate the grille tilt control
several times to purge the system of air.
6. Depress the accelerator to full throttle. Place
the grille and frame tilt control lever in the “up”
position and hold until the grille tilt cylinder has
fully extended. Continue holding the lever in
the “up” position until the pressure readings
are taken.
7. Check the pressure gauge reading. It should
read 2650 ± 50 psi (182,6 ± 3,4 bar). If not,
adjust the grille tilt “up” relief valve, Fig. 9.2,
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 grille tilt control
fully several times to purge the system of air.
11. Install the transmission cover after adjustment.
Grille Tilt “Down” Relief Valve
1. Engage the park lock, place the travel select
lever in neutral, and stop the engine.
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 of the tandem pump, Fig. 9.4.
Warning !
Warning !
Wait for the hydraulic fluid to cool before servic-
ing any hydraulic component. Hot hydraulic fluid
can cause severe burns.
Relieve hydraulic pressure before servicing any
hydraulic component. Escaping hydraulic fluid
under pressure can penetrate the skin causing
serious injury.
5. Start the engine. Operate the grille tilt control
several times to purge the system of air.
6. Depress the accelerator to full throttle. Place
the grille and frame tilt control lever in the
“down” position and hold until the grille tilt
cylinder has fully retracted. Continue holding
the lever in the “down” position until the
pressure readings are taken.
7. Check the pressure gauge reading. It should
read 2650 ± 50 psi (182,6 ± 3,4 bar). If not,
adjust the grille tilt “down” relief valve, Fig. 9.2,
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 grille tilt control
fully several times to purge the system of air.
11. Install the transmission cover after adjustment.
d. Testing
The grille tilt and slave 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 grille tilt control several times to
purge the system of air if necessary.
4. Starting with the grille down fully, tilt the grille
up fully at full engine speed. The time re-
quired for full tilt up should be 4 to 6 seconds
(no load).
Before starting the engine be sure all hydraulic
connections are tight and all tools are removed
from the forklift.
Warning !