Echo 74824 Owners Manual v.3 - Manual (Page 26)

Page 24 6" & 8" Bear Cat Chipper Operator’s Manual
6.2 HYDROSTATIC PUMP TROUBLESHOOTING (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 system.
Loose belt between engine and
pump. Adjust tension on drive belt (replace if
necessary).
Pump low on fluid. Refill reservoir. Purge air from System.
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.)
W ill not attain normal feed
rate.
W ill not feed when control
arm is moved.
Feed rate is sluggish under
load.
TROUBLESHOOTING