JLG Skytrak 6036 Service Manual page 129

Section 9. Hydraulic System
2. Operate the hydraulic controls after the engine
has stopped to relieve any trapped pressure.
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 0-1000 psi (68,9 bar) on a service
brake, Fig. 9.6.
Warning !
Before starting the engine be sure all hydraulic
connections are tight and all tools are removed
from the forklift.
5. Install a pressure gauge capable of measuring
1000 psi (68,9 bar) on the park lock bleeder
fitting, Fig. 9.6.
6. Start the engine and allow it to idle.
7. Depress the brake pedal and continue to hold
until a pressure gauge reading is taken at a
service brake.
8. Place the park lock switch in the disengaged
(down) position and check the pressure gauge
reading at the park lock bleeder fitting.
9. Pressure gauge readings should read 525 ±
25 psi (36,2 ± 1,7 bar). If not, adjust the
pressure reducing valve, turning the adjust-
ment screw clockwise to increase or counter-
clockwise to decrease pressure.
10. Stop the engine. Operate the hydraulic
controls after the engine has stopped to
relieve any trapped pressure.
11. Remove the pressure gauges and tees from
the service brake and park lock and reconnect
the hydraulic lines.
12. Install the transmission cover after adjustment.
Model 6036 S/N 9B0499 and Before
c. Testing
The service brakes 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. Bleed the brake system as described in
paragraph 9.3.2 if necessary.
4. Drive the unloaded forklift down a paved road
at road speed in third gear (approximately
11.5 mph).
5. Apply the service brakes. The forklift should
stop within 15 feet.
6. Repeat steps 4 and 5 to recheck performance.
7. Park the forklift on level ground and engage
the park lock.
8. Place the range select lever in 2nd gear. With
the service brakes applied, the forklift should
not move when the park lock is disengaged in
either forward or reverse.
9. If the service brakes do not meet performance
requirements, locate the cause of the problem
and correct before putting the vehicle into
service.
The park lock should be tested whenever repairs
or adjustments are made to park lock components.
1. Start the engine, park the forklift on level
ground and level the frame.
2. With the park lock engaged, place range
select lever in 2nd gear and travel select lever
in "F" (forward). The vehicle should not move
when full throttle is applied.
3. With the park lock engaged, place range
select lever in 2nd gear and travel select lever
in "R" (reverse). The vehicle should not move
when full throttle is applied.
4. If the park lock test does not meet perform-
ance requirements, locate the cause of the
problem and correct before putting the vehicle
into service.
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