Toro Reelmaster 7000 Service Manual page 65

Traction Circuit Problems
NOTE: When troubleshooting traction circuit problems,
if a problem exists in both mow speed (4WD) and trans-
port speed (2WD), consider a faulty component that af-
fects the entire traction circuit (e.g. charge circuit, relief
valves, piston pump, front wheel motors). If the problem
Problem
Machine operates in one direction
only.
Traction pedal reaction is sluggish
when in either mow speed (4WD) or
transport speed (2WD).
Traction pedal reaction is sluggish
when in mow speed (4WD). Pedal
reaction is normal when in transport
speed (2WD).
Machine travels too far before stop-
ping when the traction pedal is re-
leased.
Traction power is lost or machine will
not operate in either direction.
Mow speed (4WD) will not engage.
Mow speed (4WD) will not disen-
gage.
Reelmaster 7000
exists in mow speed (4WD) but not in transport speed
(2WD), consider a problem in the 4WD traction system
(e.g. rear axle motor, cartridge valves in 4WD/2WD con-
trol manifold).
Possible Cause
Traction control linkage is faulty.
Traction relief valve is defective.
Traction control linkage is stuck or binding.
Charge pressure is low.
Piston (traction) pump servo control valve orifices are plugged or
damaged.
PD1 and PD2 pilot directional valve seals in 4WD/2WD control
manifold are leaking or damaged.
Traction linkage is out of adjustment.
Charge pressure is low.
Piston (traction) pump servo control valve orifices are plugged or
damaged.
Traction pedal does not return to neutral.
Hydraulic reservoir oil level is low.
Piston pump bypass valve is open or damaged.
Charge pressure is low.
Traction circuit pressure is low.
Front wheel motor couplers are damaged.
If traction is lost in mow speed (4WD) but is normal in transport
speed (2WD), rear axle motor or rear axle motor drive may be faulty.
Electrical problem exists (see Chapter 5 -- Electrical System).
Solenoid valve SV in 4WD/2WD control manifold is faulty.
Cartridge valve(s) in 4WD/2WD control manifold is (are) faulty.
Electrical problem exists (see Chapter 5 -- Electrical System).
Cutting units are fully lowered.
Cartridge valve in 4WD/2WD control manifold is damaged or sticking.
Page 4 - - 31 Hydraulic System