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PN-51210 (Rev. 7/98)
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.
Change the system filter at 250 hour or annual intervals. Change the fluid
and filter and clean the system 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 recommended maximum.
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.
Suggested Remedy
Repair engine governor.
Repair control linkage.
Repair bypass valve.
Remove foreign material from
valve.
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
correct speed.
Control linkage damaged or
binding.
Bypass valve stuck partially
open. (Problem in one
direction 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
Contact your dealer or
factory service
department Before
servicing or repairing
any of the hydrostatic
feed components (pump,
motor, and/or relief
valve). Warranty on
these items may be void
without prior
authorization.
Hydrostatic Pump Troubleshooting
H
YDRAULIC
F
EED
M
AINTENANCE
Hydraulic Feed Maintenance