SkyTrak 6036 Service Manual - Manual (Page 170)

Section 9 Hydraulic System
9-20 Model 6036/6036T S/N 9B0500 thru 14833
1. Engage the park lock, place the travel select
lever in neutral, and stop the engine.
2. Operate the hydraulic controls after the engine
Warning
Relieve hydraulic pressure before servicing any
hydraulic component. Escaping hydraulic fluid
under pressure can penetrate the skin causing
serious injury.
has stopped to relieve any trapped pressure.
3. Remove the transmission cover from the
frame.
Warning
4. Install a tee and pressure gauge capable of
measuring 0-4000 psi
(275,6 bar) at the 15 gpm
section of the tandem pump, Fig. 9.12.
Before starting the engine be sure all hydraulic
connections are tight and all tools are removed
from the forklift.
Warning
5. Start the engine. Operate the grille tilt control
several times to purge the system of air.
6. With engine at idle, 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 2700 -100/+150 (186 -6,9/+10,3 bar). If
not, adjust the grille tilt “down” relief valve, Fig.
9.12. Turn the adjustment screw clockwise to
increase pressure or counterclockwise to
decrease pressure. Torque nuts on relief valve
to 10 ± 1.5 lb-ft (13 ± 2 Nm) after adjustment.
8. Stop the engine. Operate the hydraulic con-
trols 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 required
for full tilt up should be 4 to 6 seconds (no
load).
5. Starting at the full tilt up position, tilt the grille
down fully at full engine speed. The time
required for full tilt down should be 3 to 5
seconds (no load).
6. Repeat steps 4 and 5 to recheck performance.
7. If the grille tilt circuit test does not meet
performance requirements (refer to Trouble-
shooting, paragraph 9.8) locate the cause of
the problem and correct before putting the
vehicle into service.
Wait for the hydraulic fluid to cool before serv-
icing any hydraulic component. Hot hydraulic
fluid can cause severe burns.