Toro REELMASTER 4500-D, Service Manual

Page: 240 / 302

Rear Wheel Drive Valve Block
NOTE: If cartridge valve seals appear pitted
or damaged, the hydraulic system may be
overheating or there may be water in the
system.
Figure 64
Cleaning Solenoid Actuated Cartridge Valve
Use a deep socket to remove the valve cartridge. Use
mineral spirits to clean solenoid actuated cartridge
valves. Submerge the valve in clean mineral spirits and
use a probe to push the internal spool in and out 20 to
30 times to flush out contamination. Mineral spirits does
not affect the O–ring material. Particles as fine as talcum
powder can affect the operation of high pressure hy-
draulic valves.
NOTE: Apply clean hydraulic oil to the O–rings before
installing the valve. Use a deep socket to install the valve
into the manifold block. Tighten to a torque of 35 ft–lb (48
Nm). Install the solenoid coil. Make sure there is an
O–ring at each end of the coil. After putting the solenoid
onto the valve stem apply Loctite 242 or equivalent to
the threads on the stem before installing the nut. Tighten
the nut to a maximum torque of 15 in–lb (1.7 Nm) to
secure the solenoid; do not over–tighten.
Figure 65
Hydraulic System
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Reelmaster 4500–D