5-8
F-543-1011 Edition
TROUBLESHOOTING GUIDE
Hydraulic Power Supply Engine
Package
To troubleshoot the engine in the hydraulic engine
package, please refer to the owner’s manual that was
provided with the engine package.
OVER HEATING OF OIL IN SYSTEM
Oil passing through relief valve for
excessive time
Return control valve to neutral when not in
use
Incorrect, low, dirty oil
Use recommended oil
Fill
reservoir with clean oil. Replace filter.
Engine running too fast
Reduce engine speed.
Excessive component internal leakage
Repair or replace component as
necessary.
Restriction in filters or lines
Clean and/or replace filter or lines.
Insufficient heat radiation
Clean dirt and mud from reservoir and
components.
Malfunctioning component
Repair or replace
Excess oil going to dock level circuit
Adjust flow divider for 2.5 to 3.1 GPM flow.
FOAMING OF OIL
Incorrect, low, or dirty oil
Replace, clean or add oil as needed.
Water in oil
Replace oil
Air leaks
Check suction line and component seals
for suction leaks. Replace defective
parts.
NOISY PUMP
Low, incorrect, foamy oil
Replace, clean, or add oil as needed.
Suction line plugged
Clean out obstruction or replace line.
Flush system, replace filter.
Pump damaged
Repair or place
LEAKY PUMP
Damaged or worn shaft seal
Replace seal and/or shaft and check for
misalignment.
Loose or broken parts
Tighten or replace
CYLINDERS MOVE WITH CONTROL
VALVE IN NEUTRAL POSITION
Leaking cylinder seals or fittings
Replace worn seals or fittings.
Control valve not centering when released
Check linkage for binding and repair
Valve damaged
Repair or replace.
CONTROL VALVE LEAKS
Seals damaged or worn
Replace.
CYLINDER LEAKS
Seals worn or damaged
Replace.
Rod damaged
Replace.
Barrel damaged
Replace.
CYLINDERS DO NOT FUNCTION, OR
CREEP WITH PTO DISENGAGED
Leaking fittings or cylinder seals
Tighten loose fittings.
Replace worn seals or fittings.
Piloted check valve or O-ring leak
Replace defective component.
PROBLEM
PROBABLE CAUSE
SOLUTION
Summary of Contents for 425B Series
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Page 6: ...iv F 543 1011 Edition...
Page 14: ...2 6 F 543 1011 Edition STANDARD SPECIFICATIONS...
Page 26: ...3 12 F 543 1011 Edition OPERATING INSTRUCTIONS Figure 3 7 Steps for Loading and Unloading...
Page 32: ...3 18 F 543 1011 Edition OPERATING INSTRUCTIONS Figure 3 12 Dock Leveler Operation...
Page 61: ...MAINTENANCE AND LUBRICATION 4 21 Figure 4 13 Axle and Brake Assembly...
Page 76: ...4 36 F 543 1011 Edition MAINTENANCE AND LUBRICATION Page Intentionally Blank...
Page 86: ...5 10 F 543 1011 Edition TROUBLESHOOTING GUIDE...
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