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16
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SECTION 4 —MAINTENANCE
TROUBLE CHART
Trouble
Cause
Remedy
1) Failure to raise
load.
1 A) Insufficient oil in system.
1 A) Add oil to cylinder to
proper level.
1 B) Air in system.
1 B) Vent air from system.
1C) Pinched hydraulic hose.
1 C) Locate and relieve
pinching. Relocate or
replace hoses as
required.
1 D) Control linkage parts
worn or missing.
1 D) Check linkage for proper connec-
tions. Replace worn or missing parts
1 E) Pump not running.
1 E) Check U-Joints at PTO and pump
for tightness.
1 F) Control valve not operating. 1 F) Check valve for full throw.
1 G) Defective pump.
1 G) (See below)
Remedy: Check pressure in system observing WARNING (Safety Precautions) rules
in Section 4.2 when any adjustments are made. Disconnect hose from base end
of cylinder (temporarily plug this hole in cylinder so that all the oil is not lost.)
and connect to a 0-3000 psi (20 682 kPa) pressure gage. Run pump at about
300 rpm and read gage. DO NOT run pump this way for more than a few sec
onds at a time. The gage should read at least 1000 psi (6 894 kPa) pressure. If
pressure is below this value, pump may be defective. Replace.
2) Oil foaming
2A) Insufficient oil in system.
2A) With body raised the oil level
should be 2” (50.80 mm) to
3” (76.20 mm) below the
cylinder fill hole.
2B) Suction line hose fittings
loosse, allowing air to enter
system.
2B) Tighten hoses and fittings;
vent air from system.
