Echo 71825 - Manual (Page 18)

16
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 contami-
nated 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 main jack shaft on the main
hydraulic feed housing. Grease periodically.
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.
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.
Hydraulic Feed Maintenance
Caution: Hydraulic systems contain
fluid under high pressure. Never check
for leaks with your hands. Relieve
pressure before disconnecting any
hydraulic lines.