Owner manual

PTO CHIPPERS
21
TROUBLESHOOTING
PROBLEM PROBABLE CAUSE SUGGESTED SOLUTIONS
Will not attain normal
feed rate
Engine not operating at correct speed. Repair engine governor.
Control linkage damaged or binding. Repair control linkage.
Bypass valve stuck partially open (Prob-
lem in one direction only).
Repair bypass valve.
Remove foreign material from valve.
Will not feed when
control arm is moved.
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 spined
coupling, etc.)
Pump low on uid.
Rell reservoir. Purge air from
transmission.
Feed rate is sluggish
under load.
Loose drive belt between engine and
pump.
Tension drive belt (replace if necessary).
Pump low on uid.
Rell reservoir. Purge air from
transmission if necessary.
Large amount of water in hydraulic uid
(evaporates when hot, resulting in low
uid level).
Drain uid from reservoir and unit, re-
place lter element, and rell with new
uid.
Hydraulic feed will not
pull in logs over 9" in
diameter.
Hydraulic system overloading.
Check relief pressure in system with a
pressure gauge rated to 2500 psi (sys-
tem set by factory at 1750 psi).
7.2 HYDROSTATIC PUMP TROUBLESHOOTING