Mow Circuit Problems - Toro Greensmaster TriFlex 3300 Service Manual

Mow Circuit Problems

Problem
Gear pump is noisy (cavitation).
Reels will not turn.
Reel speed is erratic.
Reel speed is low.
Hydraulic System
Possible Cause
Reservoir oil level is low.
Gear pump suction line is restricted.
Gear pump suction line has an air leak.
Proportional relief valve (PRV) in mow control manifold is stuck
open (not shifting to its energized position).
An electrical problem exists that prevents correct operation of pro-
portional relief valve (PRV) in mow control manifold (see Chapter 5
-- Electrical System).
Pressure reducing valve (PORV) in mow control manifold is not
shifting.
Logic cartridge valve (LC) in mow control manifold is stuck open.
Front gear pump section for mow circuit is damaged (see Mow Cir-
cuit Gear Pump Flow Test in the Testing section of this chapter).
A cutting unit problem exists (see Cutting Unit chapter).
Mow control manifold cartridge valve is leaking or damaged.
Mow control manifold orifice is plugged.
Engine speed is too low.
Reel speed on mow control manifold not adjusted correctly.
A cutting unit problem exists (see Cutting Unit chapter).
Mow control manifold cartridge valve is leaking or damaged.
Excessive internal wear in reel motor exists (see Reel Motor Case
Drain Flow Test in the Testing section of this chapter).
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