3-3
6
PRESSURE SETTINGS:
The hydraulic system is divided into three pressure circuits, each having its own protective relief
valve. The functions operated by the control valve sections require different pressures for dif-
ferent functions. These are covered in sections below:
1.
Hoist, Boom, & Swing Circuit
-- 4000 PSI (276 bar) at full flow
2.
Outrigger Circuit
-- 3000 PSI (207 bar) at full flow
3.
Brake Circuit
– 2925 PSI (202 bar) at full flow (Non-adjustable, see
Brake Maintanence
section)
BRAKE SYSTEM CIRCUIT:
The pressure is set at the factory and should not require adjustment. The pressure can be
checked as described in the
Brake Maintenance
section.
BOOM LIFT CYLINDER HOLDING VALVES:
A holding valve is mounted into the base of the boom lift cylinder barrel. This valve is designed
to hold the boom in position should loss of power or pressure line failure occur.
To check the boom lift cylinder holding valve, set the outriggers, place the boom in the horizon-
tal position over the front of the crane, and raise rated load about 6 inches (15 cm) above the
ground using the boom lift cylinder (not the hoist). The best load for this test is the rated load at
the 20-foot (6.0 m) load radius, with outriggers extended and the boom over the front. Turn the
engine OFF and put the key in the ON position. Actuate the BOOM DOWN valve spool on the
upper control valve. If the boom moves down, a holding valve may be malfunctioning or a boom
lift cylinder may have leakage past the piston seal.
W A R N I N G
Before working on the holding valves or plumbing to the boom lift cylinders, always re-
lieve trapped pressure. Lower the boom fully, turn off the engine, turn on the key and
cycle the BOOM control.
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