Walker R21 User Manual

R21 General Information
5
Specications
ENGINE
Manufacturer/Model Kohler KT620
Displacement cu. in. (cc) 40.3 (660)
Max. Power HP (kW) 21 (15.7) @ 3600 RPM
Governed RPM 3600
Max. Torque lb
·ft (N·m)
35.9 (48.7)
Idle RPM 1750
Spark Plug Type Champion® type RC12YC (or equivalent)
Spark Plug Gap in. (mm) .030 (0.76)
Crankcase Capacity qt (L) 2.0 (1.9)
Crankcase Lubricant API SJ or Higher Grade Oil Only with 10W-30 Viscosity Above 0° F
(-18° C), or 5W-30 Viscosity Below 32° F (0° C)
Oil Filter Kohler P/N 12 050 01-S
Fuel Tank Capacity gal (L) 3 (11.4)
Fuel Automotive Grade Unleaded Gasoline (87 Octane Minimum,
10% Ethanol Maximum)
Cooling System Air-Cooled
Air Cleaner Engine Mounted (Kohler)
Kohler P/N 16 083 04-S (Filter), 16 083 05-S (Precleaner)
ELECTRICAL SYSTEM
Battery 12 Volt, 300 CCA (Interstate SP-35)
Charging System Flywheel Alternator
Charging Output 18 Amp DC (Regulated)
System Polarity Negative Ground
Ignition Electronic Capacitive Discharge
Starter 12 Volt Electric, Key and Solenoid Operated
Interlock Switches Ignition Lockout by Seat Switch, Transmission Neutral, Blade
Clutch, Parking Brake, and Deck Arm Lock
Circuit Breaker(s) Two Fuses (5A)
Auto Reset (30A)
BLADE DRIVE
PTO Single belt
Blade Drive Clutch and Brake Electric Clutch [Stops Blades within Five (5) Seconds of Disengage-
ment]

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)