Walker R21 User Manual

R21 Maintenance
41
Check Tire Pressure
Frequency: Every 25 hours
Inate tires to the pressures shown below:
Drive Tires = 15 PSI (103 kPa)
Tailwheel = 20 PSI (137 kPa)
Check Drive Belts (Ground Drive,
Blade)
Frequency: Every 25 hours
There are two belts used for the R21: the blade
drive belt and the ground drive belt. They need to
regularly be inspected for wear.
Ground Drive Belt
Blade Drive
Belt
R21 Belts
1. With the engine turned off, raise the seat pan-
el for access to the ground drive belt. Visually
inspect the belt.
2. If the belt shows signs of cracking or deterio-
rating, the belt must be replaced. See “Belt
Replacement” on page 51 for details.
3. Raise the footrest on the deck.
4. Remove the four (4) wing nuts on the deck
belt cover and slide the cover out. Visually
inspect the Blade Drive Belt.
5. If the belt shows signs of cracking or deterio-
rating, the belt must be replaced. See “Belt
Replacement” on page 51 for details.
Check Safety Switch System
Frequency: Every 25 hours
WARNING
It is important to check and maintain the safety
switch system for safe operation of the ma-
chine.
There are ve (5) safety interlock switches on the
tractor: seat switch, FSC Neutral-Park switch, PTO
switch, parking brake switch, and deck hinge lock
switch. These safety switches work together to
ensure that the mower engine can only be started
when all the following criteria is met:
● The Forward Speed Control (FSC) is disen-
gaged in NEUTRAL-PARK.
● The blade clutch (PTO) is disengaged.
● The parking brake is engaged.
● The deck hinge is locked.
The operator does not need to be seated to start
the engine. The operator does need to be seated
before the Forward Speed Control (FSC) can be
engaged, the blade clutch (PTO) can be engaged,
or the parking brake can be disengaged.
The following combinations should be tested to
ensure all the safety switches are functioning
properly:
● With or without an operator in the seat and
with the engine running (with the PTO disen-
gaged for safety reasons), disengage the deck
hinge lock located on the RH hinge and the
engine should immediately stop.

Walker R21 Specifications

General

Drive System	Hydrostatic
Cutting Height	1.5 - 4.5 inches
Engine	Kohler CH740
Engine Type	Air-cooled
Cutting Width	52 inch
Wheel Size	20 inches (rear)