Traction Circuit Problems - Toro 04384 Service Manual

Traction Circuit Problems

Problem
Neutral is difficult to find or unit oper-
ates in one direction only.
Traction response is sluggish.
No traction exists in either direction.
Wheel motor will not turn.
Wheel motor will not hold load in
neutral.
NOTE: The piston pump used on Greensmaster
3250--D machines is equipped with relief valves for both
the forward and reverse direction. Due to engine output,
it is unlikely that traction pressure will reach relief valve
settings. If, however, a piston pump relief valve is leak-
ing or otherwise faulty, traction performance would be
affected.
Hydraulic System
Possible Cause
External traction control linkage is misadjusted, disconnected, bind-
ing or damaged.
Piston (traction) pump is worn or damaged (see Piston (Traction)
Pump Flow Test).
Hydraulic oil is very cold.
Brakes are binding 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).
Piston 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).
Brakes are binding or are incorrectly adjusted.
Oil level in reservoir is low (other hydraulic circuits affected as well).
Piston pump by--pass valve is open or defective.
Charge pressure is low (see Charge Pressure Relief Valve Pres-
sure Test).
Piston (traction) pump or wheel motor(s) are worn or damaged (see
Piston (Traction) Pump Flow and Wheel Motor Efficiency Tests).
Brakes are binding or are incorrectly adjusted.
Key on wheel motor shaft is sheared or missing.
Wheel motor is damaged.
Make up fluid from charge pump is not available.
Piston pump relief valves are leaking or damaged.
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