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Greensmaster 3320/3420 Hydraulic SystemPage 5 -- 25
Traction Circuit Problems
Problem Possible Cause
Neutral is difficult to find or unit oper-
ates in one direction only.
External traction control linkage is misadjusted, disconnected, bind-
ing or damaged.
Piston (traction) pump is worn or damaged (see Piston (Traction)
Pump Flow Test in the Testing section of t his chapter).
Traction response is sluggish. Hydraulic oil is very cold.
Parking brake is applied or incorrectly adjusted.
Piston pump by--pass valve is open or defective.
Charge pressure is low (see Charge Relief Valve Pressure Test in
the Testing section of this chapter).
Relief valve(s) in piston (traction) pump are leaking or damaged.
Wheel motor(s) is 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 Test in the Testing section of t his chapter).
No traction exists in either direction. Parking brake is applied or incorrectly adjusted.
Oil level in reservoir is low (other hydraulic systems also affected).
Piston pump by--pass valve is open.
Charge pressure is low (see Charge Relief Valve Pressure Test in
the Testing section of this chapter).
Relief valve(s) in piston (traction) pump are leaking or damaged.
Wheel motor(s) is worn or damaged (see Wheel Motor Efficiency
Test in the Testing section of this chapter).
Piston pump is worn or damaged (see Piston (Traction) Pump Flow
Test 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 damaged.
Wheel motor will not hold load in
neutral.
Make up fluid from charge pump is not available.
Piston pump relief valves are damaged.
NOTE: ThepistonpumpusedonGreensmasterTri-
Flex machines isequipped with relief valves for boththe
forward and reverse direction. Due to engine output, it
is unlikely that traction pressure will reach r elief valve
settings. If, however, a piston pump relief valve is leak-
ing or o therwise faulty, traction performance would be
affected.
Hydraulic
System