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4 — MAINTENANCE
4-7
Hydraulic Pressure Checks and Adjustments
Hydraulic pressures are set at the factory and should not be adjusted unless a hydraulic
component has been replaced in the regulated circuit.
On the gas engine model a pressure test port (Figure 4-5) is located at the ground station
boom control valves. A hydraulic pressure gage [0-6000 psig (0-400 bar) (41 000 kPa
gage) minimum range] must be connected to the test port when adjusting hydraulic pres-
sures. This is the only pressure test port on the boom lift.
On the DC model boom lift, the main bypass valve and pressure test port are mounted on
the hydraulic manifold located between the hydraulic pump and reservoir. To prevent
tampering, the main bypass valve cap is secured with locking wire and a seal. If a pres-
sure adjustment is required, call Bil-Jax and request a replacement lock wire and seal.
The boom lift has four bypass valves that regulate hydraulic operating pressures. These
include (1) the main bypass valve, (2) the outriggers bypass valve, (3) the basket station
boom controls bypass valve, and (4) the ground station boom controls bypass valve.
Check/Adjust System and Outriggers Hydraulic Pressures
The system hydraulic pressure (pump output pressure) is regulated by the main bypass
valve. The system hydraulic pressure is used to power all hydraulic operations. The main
bypass valve and pressure test port for the gas model boom lift are shown in (Figure 4-5).
MAIN
BYPASS
VALVE
PRESSURE
TEST PORT
Figure 4-5. Main Bypass Valve and Pressure Test Port
(Gas Engine Model)