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Maintenance Instructions CHECKING/SERVICING
Spark Plugs
Every 200 hours of operation, remove the spark
plugs, inspect, clean, and reset the gap (or replace
with new plugs). Before removing the spark plugs,
clean the area around the base of the plugs to keep
dirt and debris out of the engine. Clean spark plugs
with a wire brush. DO NOT use an abrasive grit
type cleaner. If the electrodes are burned short or
pitted, replace the plug (refer to Specications for the
proper type of replacement plug). Check spark plug
gap with a wiretype feeler gauge and set the gap to
0.030 in. (0.76 mm). Reinstall and tighten to 20 lb·ft
(27 N·m). Both spark plugs should be replaced
yearly.
Ignition Wires
Good preventive maintenance calls for complete re-
placement of spark plug wires every two (2) years.
Fuel Lines and Clamps
NOTE: The engine fuel injection system is pressur
ized and should only be serviced by a Walker dealer
or authorized Briggs & Stratton service dealer.
Every year, inspect the fuel supply lines from the
tank(s) to engine for deterioration or damage. Also,
inspect the fuel line clamps for tightness. Good
preventive maintenance calls for complete replace-
ment of fuel lines and clamps every two (2) years.
Engine Starter
Yearly or every 500 hours disassemble and clean
the solenoid shift starter. Refer to the Briggs &
Stratton Service Manual for this procedure or con
tact an authorized Briggs & Stratton engine dealer
to perform this service.
Transmission Control Setting
On a yearly interval or when an outofadjustment
condition is observed, check the transmission con
trol for proper function as follows:
Neutral-Park
With the mower parked on level ground, start and
run the engine, rst at idle and then normal operat
ing speeds. With the FSC in the NEUTRAL-PARK
position, there should be no movement of either
drive tire. If the tire(s) are “creeping” forward or re
verse, refer to ADJUSTMENTS for the Neutral
Function Adjustment - Step 3 in this section.
Straight Ground Tracking
Check for straight ground track by driving on a
smooth, level surface with hands o the steering le
vers. Set the FSC at dierent speeds and observe
if the mower moves in a straight line (use a cement
joint or other line on the ground for reference). If the
machine is drifting to the right or left, refer to
ADJUSTMENTS for Straight Tracking Adjustment -
Step 5 in this section.
Blade Brake Action
WARNING
It is important to check and maintain
blade brake action for safe operation of
the ma chine.
Check the function of the cutter blade brake by en
gaging the blade clutch (PTO), operating the engine
at full throttle, then disengaging the clutch and mea
suring how quickly the blades stop. Watch the rota
tion of the blade drive shaft as a visual indi cation that
movement has stopped. If the brake is working
properly, all rotation will stop ve (5) seconds
after disengagement of the clutch. If the brake sys
tem malfunctions blades do not stop in ve (5) sec
onds adjust or repair the brake before operating
the mower. Refer to ADJUSTMENTS for Clutch
Disengagement/Brake Action, Step 2 - Blade Brake
Band Adjustment on page 77.
PTO U-Joints
The PTO Ujoints should be inspected yearly for
looseness and wear. If either is noticed, the respec
tive shaft or tube should be replaced. A worn Ujoint
can cause vibration and extensive damage to the
PTO and the whole machine.
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