Page 17
6" & 8" Bear Cat Chipper Operators Manual
Troubleshooting
6.2 HYDROSTATIC PUMP TROUBLESHOOTING MODELS 72620 & 74824
Symptom
Probable Cause
Suggested Remedy
Engine not operating at correct
speed.
Repair engine governor
Control linkage damaged or
binding.
Repair control linkage.
Bypass valve stuck partially
open. (Problem in one direction
only.)
Repair bypass valve. Remove
foreign material from valve.
Control linkage damaged or not
connected
Repair or reconnect control
linkage
Drive between engine and
pump damaged
Repair drive (replace broken
belt, repair sheared key, repair
splined coupling, etc.
Pump low on fluid.
Refill reservoir. Purge air from
transmission.
Loose belt between engine and
pump.
Tension drive belt (replace if
necessary).
Pump low on fluid.
Refill reservoir. Purge air from
transmission.
Large amount of water in
hydraulic fluid (evaporates
when hot resulting in low fluid
level).
Drain fluid from reservoir and
unit, replace filter element, and
refill with new fluid.
Hydraulic feed will not pull in
logs over 4" in diameter, or
continuously stalls or stops
Hydraulic system overloading
and causing system to go over
relief.
Check relief pressure in
system with a pressure gauge
rated to 2500 psi. (System set
by factory at 1750 psi.)
Will not attain normal feed rate
Will not feed when control arm
is moved
Feed rate is sluggish under
load
