Greensmaster 3300/3400Hydraulic System Page 5 -- 28
Mow Circuit Problems
Problem Possible Cause
Gear pump is noisy (cavitation). Reservoir oil level is low.
Gear pump suction line is restricted.
Gear pump suction line has an air leak.
Reels will not turn. 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 c ontrol 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).
Reel speed is erratic. A cutting unit problem exists (see Cutting Unit chapter).
Mow control manifold cartridge valve is leaking or damaged.
Mow control manifold orifice is plugged.
Reel speed is low. 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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