Echo 72928 Owners Manual v.4 - Manual (Page 24)

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S E C T I O N 3
Tension drive belt (replace if
necessary).
Refill reservoir. Purge air from
transmission if necessary.
Drain fluid from reservoir and
unit, replace filter element,
and refill with new fluid.
Check relief pressure in sys-
tem with a pressure gauge
rated to 2500 psi. (System set
by factory at 1750 psi.)
Repair or reconnect control
linkage.
Repair drive (replace broken
belt, repair sheared key, re-
pair splined coupling, etc.).
Refill reservoir. Purge air from
transmission.
Symptom
Will not attain normal feed rate.
Will not feed when control arm
is moved.
Feed rate is sluggish under
load.
Hydraulic Feed will not pull in
logs over 4" in diameter, or
continuously stalls or stops.
Probable Cause
Engine not operating at cor-
rect speed.
Control linkage damaged or
binding.
Bypass valve stuck partially
open. (Problem in one direc-
tion only.)
Control linkage damaged or
not connected.
Drive between engine and
pump damaged.
Pump low on fluid.
Loose drive belt between
engine and pump.
Pump low on fluid.
Large amount of water in hy-
draulic fluid (evaporates
when hot, resulting in low fluid
level).
Hydraulic system overloading
and causing system to go
over relief.
Suggested Remedy
Repair engine governor.
Repair control linkage.
Repair bypass valve.
Remove foreign material from
valve.
3.3 Hydrostatic Pump Troubleshooting
Before servicing or
repairing any of the
hydrostatic feed
components (pump,
motor, and/or relief
valve), contact your
dealer or factory
service department.
Warranty on these
items may be void
without prior
authorization.
Caution: Hydraulic systems contain
fluid under high pressure. Never check
for leaks with your hands. Relieve
pressure before disconnecting any
hydraulic lines.
3.1.7 Greaseable Bearings and Pivots
The chipper has five greaseable bearings and pivots that
require grease every 50 hours:
• Two bearings on the rotor shaft.
• One greaseable bushing on the foot pedal pivot.
• One grease zerk on idler pivot.
• One grease zerk on discharge chute.
Service engine according to engine manual. Change
engine oil and filter as recommended in manual.
3.1.8 Trailer Service Tips
1. Check wheel bolt torque every 10 hours of towing use.
2. Check air pressure in tires every 10 hours of towing.
3. Check and repack wheel bearings with grease every
12 months.
4. When towing, always connect the safety chains.
Make sure trailer hitch bolts are tight and secure.
5. Check trailer lights.
3.2 Hydraulic Feed Maintenance
NOTE: Check the reservoir daily for proper fluid level,
the presence of water (noted by a cloudy to milky
appearance, or free water in bottom of reservoir), and
rancid fluid odor (excessive heat).
The hydrostatic pump normally does not require regular
fluid changes. The system filter should be changed at
250 hour or annual intervals. The fluid and filter should
be changed and system cleaned if the fluid becomes
contaminated with foreign matter (water, dirt, grease,
etc.) or if the fluid has been subjected to temperature
levels greater than the maximum recommended.
There is a greaseable bearing on each side of the shaft
on the hydraulic feed housing. Grease periodically.