Wright Manufacturing Sentar 26980 - Manual (Page 14)

about 10 seconds apart. If the blades do not start
and stop in a few seconds each time, service the
blade brake system or contact your local Wright
dealer. Under mowing load, the clutch’s life will be
the greatest at the highest RPM setting.
How to Test the Operator Presence Control
(OPC) Switch
With the parking brakes applied and the blades ON,
try lifting your feet off the foot platform to test the
Operator Presence Control switch (OPC). The
engine should kill and the blades should stop within a
few seconds. If not, service the OPC system or
contact your local Wright dealer.
11
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 in the drive tires between 18 and 24 psi.
Higher pressures will cause the tires to have less
traction which will force you to go slower and with
less safety and give you a harder ride. Keep the tire
pressure in the front caster tires between 30 and 40
psi. Higher pressures will help keep the caster tires
on their rims when impacted from the side but give a
harder ride. Some Front Casters are equipped with
non-pneumatic tires and do not required any air.
They do not have any tread but should be replaced
when excessively worn.
Height-of-Cut
Before adjusting the height-of-cut be sure the mower
blades are not spinning, and all four tires have proper
air pressure. Check for even tire wear. The height-
of-cut can be adjusted the following ways:
• Pull the deck lift lever on the right hand side of the
mower towards the rear of the mower until it clicks
once into the locked transport position. Then set
the mower blade height with the selector on the left
hand side of the mower. Once the proper height
setting is set on the left, pull back on the deck lift
lever on the right hand side and then lower the
lever towards the front of the machine until it stops
at the set height of cut.
Deck Adjustments
The mower deck can be adjusted for pitch and side-
to-side lever. Pitch is the relationship between the
front of the deck and the rear of the deck in regards
to height of cut. In most cases, a positive pitch (front
of the deck lower than the rear of the deck) of ¼” is
the optimum setting. These two adjustments can
easily be made by using the threaded deck hangers
located at each corner of the deck. These hangers
are connected to the chains that hold the deck.
Simply rotate the hanger at the corner of the deck
that needs adjustment. These hangers are right-
handed threads. If you raise the rear hangers above
the factory setting, the deck may not raise all the way
up into transport position. Be sure and check the
deck height of cut range after any adjustments are
made to these hangers to ensure that the height of
cut adjustments work properly. If unable to make the
adjustments needed by only using these hangers,
contact your dealer for assistance.
Belt Tension Adjustment
The pump drive belt is self-adjusting, and requires no
adjustment, just replacement. The blade drive belts
are self-adjusting also and require no adjustment, just
replacement.
WARNING
How to Move the Mower if the Engine
Won’t Start
Rotate both of the manual “release” valve levers on
the rear of each hydraulic pump about ½ turn
counterclockwise. It is important not to over tighten
these levers. Damage may occur to the pump if this
valve is over tightened.
Bleeding Air from the Hydraulic
System
Whenever servicing the hydraulic system, it is of the
utmost importance to keep any dirt or debris from
getting into the system. Clean off all parts before
disassembly and assembly. When any of the
hydraulic parts are disconnected or removed or when
the oil is changed, air must be bled from the system.
If air is entrained in the system, loss of power,
excessive heat, and damage to the hydraulic pumps
may occur. First, make sure the oil level in the
reservoir is correct. The level should be between 3”
– 4” below the top of the oil fill tube. Use fully
synthetic oil: Mobil 1 15W-