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Reelmaster 3550−D Hydraulic SystemPage 4 − 27
Traction Circuit Problems
Problem Possible Cause
Neutral is difficult to find or machine
operates in one direction only.
External control linkage is misadjusted, disconnected, binding or
damaged.
Traction pump/hydrostat is worn or damaged.
Traction response is sluggish. Bypass valve in traction pump/hydrostat is open or defective.
Brake is not released.
Hydraulic oil is very cold.
Traction charge pressure is low.
Traction pump/hydrostat or wheel motor(s) are worn or damaged.
No traction exists in either direction. Brake is not released.
Oil level in hydraulic tank is low
(NOTE: Other hydraulic systems are affected as well).
Bypass valve in traction pump/hydrostat is open or defective.
Traction pump/hydrostat drive belt is loose or broken.
Traction relief valve is damaged − open.
Traction charge pressure is low.
Traction pump/hydrostat or wheel motor(s) are worn or damaged.
Wheel will not turn. Brakes are binding.
Key on wheel motor shaft is sheared or missing.
Internal parts in wheel motor are damaged.
Unit rolls when stopped on an incline
− Engine Running (up to 10% grade
and parking brake disengaged).
Make up fluid from charge pump is not available.
Hydrostat check valves are damaged.
Unit rolls when stopped on an incline
− Engine Not Running (up to 10%
grade, wheels straight and parking
brake disengaged).
Wheel motor(s) are worn or damaged (see Testing in this Chapter).
NOTE: If unit rolls away straight, both front wheel motors are worn.
If the unit turns to one side as it rolls away, the wheel motor on the
outside of the turn is worn.
Hydraulic
System