7.11 Diagnosis (Boom) – 7 Load Handling
Maintenance Manual Ottawa T2 4x2
–
Hydraulic Pump with Priority Valve Tests – Boom
Issue – Boom Slow to Lift
1.
Check control valve pressure setting.
a. Install 3000 psi pressure gauge at the test port in the cyl-
inder hose bulkhead fitting located at the back of the
boom platform just in front of the fifth wheel plate.
b. Deadhead cylinders at maximum length.
c. Record pressure reading at maximum engine RPM
________ psi.
2.
If pressure reading is not equal to 2000 psi, adjust the relief
pressure at the control valve.
a. Remove the acorn nut located in front of the control valve
below the control valve lever.
b. Adjust the pressure using a 5/16 allen wrench. Turn ad-
justing screw 1/4 turn and recheck pressure. To increase
the pressure, turn the adjusting screw clockwise. To de-
crease the pressure, turn the adjusting screw counter-
clockwise.
3.
If the pressure reading is at 2000 psi, install a steering
analyzer or flow meter between the pump and control valve
and record the maximum flow at engine idle as the boom is
raised and lowered __________GPM. The flow should be 3-
1/2 to 5 GPM at engine idle and 23-25 GPM at maximum
engine RPMS.
Valve actuating cable/lever not
centered
Adjust. Unbind. Lubricate as
needed.
Stalls under load
Low fluid level
Add fluid as needed.
Low relief valve setting
Adjust or replace.
Extraordinary internal leakage
Test circuits to isolate point of
leakage.
External leakage from hoses
Replace leaking hose.
Extraordinary pump wear
Replace.
Inoperative
Seized or damaged lever or control
cable
Repair as needed.
Extreme internal leakage
Test circuits to isolate point of
leakage.
Jerky, erratic movement
External leakage from hoses
Replace leaking hose.
Air in system
Inspect fittings and seals. Replace
as needed.
Observation
Cause
Action
Содержание Ottawa t2
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