18” CHIPPER TROUBLESHOOTING GUIDE
57
COMPLAINT CAUSE CORRECTION
Chipper bearings are
overheating
• Bearings are dry
• Check the chipper bearing
retainer cap for tightness
• Bearings worn out
• Setscrews on sheave side
bearing not tight
• Grease bearings daily using
Texaco® Starplex II grease
• Retighten bolts or setscrews
as tight as possible
• Replace
• Tighten
Feeding material causes feed
wheels to slow down or stop
• Dull knives
• Relief valve is worn or dirty
• Pump has excessive wear
• Feed wheel motor(s) not
working properly
• Feed wheel springs to tight
• Replace knives (see
Servicing Cutter System
section)
• Clean or replace; reset
pressure
• Replace
• Check & replace
• Adjust
One or both feed wheels don’t
turn or turn too slow to feed
material
• Feed wheel motor(s) not
working properly
• Feed wheel drive chain
tension too loose
• Relief valve opens too easily
or stuck open
• Feed wheel valve (control
valve) worn & leaking
internally
• Feed wheel relief pressure
off
• One or more hoses may be
crimped or leaking
• Hydraulic oil level low
• Pump has excessive wear
• Feed wheels binding
• Control lever improperly
shifting valve
• Worn or dirty flow divider
• Reverse hoses at flow
divider - if same motor still
doesn't turn, motor is
probably bad; if other motor
is now the one not turning,
the flow divider is probably
bad. Repair or replace
• Check and adjust chain
tension if necessary
• Valve needs to be cleaned or
replaced; reset pressure
• Check & Replace
• Reset pressure to 2500 PSI
• Replace (see Servicing
Hydraulics section)
• Keep oil level about 7/8 full
• Replace pump
• Check bearings, lubricate
properly
• Readjust; valve must open
completely
• Clean or replace
Chain slipping • Chain too loose
• Sprocket worn or teeth
missing
• Chain broken
• See Maintenance Section to
check tension
• Replace sprocket that is
worn or damaged
• Replace the chain
(See the Servicing Feed Wheel
Motor section)
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