12” 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
•
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
•
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
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