Wright Serial # 32274 and Higher - Manual (Page 15)

in a few seconds each time, service the blade
brake system or contact your local Wright dealer.
Under mowing load, the clutch’s longevity will be
the greatest at the 3/4-throttle setting.
How to Test the Operator Presence
Control (OPC) Switch
Before beginning this test, secure a large open
area that is free of obstacles or hazards.
To test the OPC switch start the engine using the
normal starting procedures, release the parking
brake and place the speed control in the slowest
speed setting. While engaging the OPC lever(s)
engage the blades by pulling up on the PTO blade
clutch switch. Allow the mower to start moving
forward and then release the mower handles. If
the engine doesn’t stop, then service the OPC
system. Never operate the blades without a
properly working OPC switch and safety shutoff
circuit.
9
Service and Adjustments
Tire Maintenance and Pressure
Excessively worn tire tread is dangerous on all
hills. Replace drive tires with less than 3/32” of any
tread groove left. Use tires with the tread pattern
recommended by Wright Mfg., Inc. only. Keep the
tire pressure at the proper level. Higher pressures
will cause the tires to have less traction, which will
force you to go slower, with less safety and give
you a harder ride. Higher pressures will help keep
the front caster tires on their rims when impacted
from the side but give a harder ride. They do not
have any tread but should be replaced when
excessively worn.
Blade Adjustments and Height-of-Cut
Before Adjusting the Height-of-Cut be sure of
proper air pressure in all four tires and check for
even tire wear. The height-of-cut can be adjusted
the following ways:
• Coarse Adjustment: For the coarse adjustment
the rear wheels, the front casters should be
adjusted at the same time.
The rear wheels adjust by pivoting the rear axle,
See Parts List, by the upper support bolt. It will
be necessary to jack up the rear of the mower
and place it on blocks. The rear wheels do not
need to be removed. Make certain there is no
weight on the rear axle before loosening any
hardware. Loosen the upper pivot bolts
slightly. Allow all threads to remain engaged
on the nut. Remove the bolts on the lower
portion of the rear axle weldment. The bolts
are accessible from the inside of the tractor
body. Align the rear axle with one of the five
adjustment holes in the tractor body. Each
adjustment setting changes the mower height
by 0.75”.
a. Use the highest hole in tractor frame for
cutting heights of 1.75”-3.0”.
b. Use the second highest hole in tractor
frame for cutting heights of 2.5”-3.75”,
factory setting.
c. Use the middle hold in the tractor frame
for cutting heights of 3.25”-4.5”.
d. Use the lowest two holes in tractor
frame for cutting heights of 4.0”-5.75”.
Adjust the front caster arms at their respective
support brackets equally in one of the
seven settings up or down 0.25” each
through a 1.5” total range.
WARNING
a. This should be done with two shims (or
spacers) on the bottom and one shim
on the top of the caster support arm.
b. The front-to-rear leveling of the blades
should be between level and .25” lower
(preferred) at the front of the blades but
never higher at the front.
• Temporary Height-of-Cut Adjustment: Using
the caster shims (or spacers) you can adjust
the blades downward temporarily .5” or 1”
below the original coarse setting as described
above. This assumes that the blades are level
with two shims (or spacers) on the bottom and
one shim on the top of the caster support arm.
With the blades level at this assumed starting
point, you should never move all of the shims
to the bottom since that would make the
blades higher at the front.
The angle of attack of the blades should
always be level or lower at the front. This
makes the blade cut the grass only once
and saves fuel and wear on the whole
mower. It also allows more efficient
mowing and grass catching or dispersal. If
you mow in an area of the country where
the lawn is very thick and spongy you may
have to set these two adjustments as they
would appear on the grass and not on a