White Outdoor LT-5 Service Manual page 15

6.12. The by-pass valve and brake are visible beneath
the right side frame channel. See Figure 6.12.
By-pass valve
Figure 6.12
• The by-pass valve is open when the by-pass
rod and lever are back. It is closed for normal
operation when the rod and lever are at the for-
ward end of their travel.
• An open by-pass valve will disable the transaxle.
• Open the by-pass to push the tractor.
• The brake is properly adjusted when a .015"
(.381 mm) feeler gauge will slip between the pad
and the rotor.
• Brake adjustment is made by removing the cot-
ter pin from the castle-nut and rotating the nut to
tighten or loosen the clearance between the
pads and the rotor. There is no linkage adjust-
ment.
• Replace the cotter pin with a new one after
making any brake adjustment.
• A tight or stuck brake can cause symptoms
similar to low fluid: noisy operation and sluggish
performance. In addition to these symptoms,
the brake will become extremely hot, and the
rotor will become discolored.
Brake
caliper
Brake rotor
700 SERIES LAWN TRACTORS
6.13. The brake rod pulls on a spring that is hooked to
the cam-arm on the brake caliper. The cam-arm
forces two pins inward against a backing plate
and brake pad. The pad forces the floating rotor
against a second pad located behind the rotor.
The pinching action creates the friction neces-
sary to stop or hold the tractor.
6.14. A return spring pulls the cam arm back to relieve
the friction when the brake pedal is released.
See Figure 6.14.
Return spring
Cam arm
6.15. Slightly above and behind the brake assembly is
the friction pack. The friction pack maintains a
set amount of resistance in the control linkage:
See Figure 6.15.
• Too much resistance may raise control effort to
an unacceptable level. This would be caused by
an over-tightened nut on the friction pack.
11
Brake rod
Extension spring
Figure 6.14
Friction pack
Figure 6.15