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Greensmaster 3150Hydraulic System Page 4 -- 22
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.
Piston (traction) pump is worn or damaged (see Piston (Traction)
Pump Flow Te st in the Testing section of this chapter).
Traction response is sluggish. Hydraulic oil is very cold.
Brakes are applied or are incorrectly adjusted.
Piston pump by--pass valve is open or defective.
Charge pressure is low (see Charge Pressure Relief Valve Pres-
sure Test in the Testing section of this chapter).
Piston (traction) pump relief valves are leaking or damaged.
Piston (traction) pump or wheel motor(s) are worn or damaged (see
Piston (Traction) Pump Flow and Wheel Motor Efficiency Tests in
the Testing section of this chapter).
No traction exists in either direction. Brakes are applied or are incorrectly adjusted.
Hydraulic reservoir oil level is low (other hydraulic circuits affected
as well).
Piston pump by--pass valve is open.
Charge pressure is low (see Charge Pressure Relief Valve Pres-
sure Test in the Testing section of this chapter).
Wheel motor(s) are worn or damaged (see Wheel Motor Efficiency
Test in the Testing section of this chapter).
Piston (traction) pump is worn or damaged (see Piston (Traction)
Pump Flow Te st in the Testing section of this chapter).
Wheel motor will not turn. Brakes are binding.
Key on wheel motor shaft is sheared or missing.
Wheel motor is damage d.
Wheel motor will not hold load in
neutral.
Make up fluid from charge pump is not available.
Piston (traction) pump relief valves are leaking or damaged.
NOTE: The piston (traction) pump used on Green-
smaster 3150 machines is equipped with relief valves
for both the forward a nd reverse direction. Due to engine
output, it is unlikelythat traction pressurewill reachrelief
valve settings. If, however, a piston pump relief valve is
leaking or otherwise faulty, traction performance would
be affected.