Skytrak 6036 Service Manual Bedienungsanleitung PDF herunterladen (Seite 156)

Section 9 Hydraulic System

9-6

Model 6036/6036T S/N 9B0500 thru 14833

Before starting the engine be sure all hydraulic

connections are tight and all tools are removed

from the forklift.

Wait for the hydraulic fluid to cool before serv-

icing any hydraulic component. Hot hydraulic

fluid can cause severe burns.

The counterbalance valve in each boom hoist

cylinder serves another main function for safety

purposes. This function can be described as

follows:

• Should any of the hydraulic lines going to

either hoist cylinder fail, there will be a

loss of hydraulic system pressure to the

cylinder(s).

Example:

If there was a

hydraulic line failure in the pressurized

lowering line during lowering, the counter-

balance valve would lose pilot pressure

closing off flow returning to the reservoir.

The oil in the base end of the cylinder

would then be trapped, which would

immediately stop boom lowering and

prevent an elevated load from falling to

the ground uncontrolled. The load can be

lowered safely to the ground by following

the “Emergency Boom Lowering” proce-

dures in your Owners/Operators Manual.

IMPORTANT: DO NOT attempt to reset the

counterbalance valve cartridges. In the event that

the counterbalance valve cartridges were disabled

for emergency boom lowering or any unauthorized

adjustments are ever made to these cartridges,

remove and replace both cartridges with new

parts. Failure to replace these cartridges with new

parts may alter the holding characteristics of the

counterbalance valves creating an unsafe condi-

tion for machine operation.

Warning

Relieve hydraulic pressure before servicing any

hydraulic component. Escaping hydraulic fluid

under pressure can penetrate the skin causing

serious injury.

2. Operate the hydraulic controls after the

engine has stopped to relieve any trapped

pressure.

Warning

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

tandem pump outlet of the 30 gpm section.

Relieve hydraulic pressure before servicing any

hydraulic component. Escaping hydraulic fluid

under pressure can penetrate the skin causing

serious injury.

Warning

2. Operate the hydraulic controls after the engine

has stopped to relieve any trapped pressure.

3. Remove the transmission cover from the

frame.

Warning

b. Pressure Checks and Adjustments

Main Relief Valve

1. Engage the park lock, place the travel select

lever in neutral, and stop the engine.

5. Start the engine. Raise and lower the boom

fully several times to purge the system of air.

6. Depress the accelerator to full throttle. Place

the joystick in the “lower” position and hold until

the hoist cylinders have fully retracted. Con-

tinue holding the joystick in the “lower” position

until the pressure readings are taken.

7. Check the pressure gauge reading. It should

read 2700 -100/+150 psi (186 -6,9/+10,3 bar).

If not, adjust the main relief valve, Fig. 9.3, by

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 ± 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. Raise and lower the boom

fully several times to purge the system of air.

11. Install the transmission cover after adjustment.

Boom Raise Port Relief Valve

1. Engage the park lock, place the travel select

lever in neutral, and stop the engine.

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