Echo 72854s - Manual (Page 26)

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S E C T I O N 6
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.
6.2 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.