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Installing the Spark Plug
1. Install the spark plug and the metal washer. Ensure that
the air gap is set correctly.
2. Tighten the spark plug to 18 ft.-lb. (24 N.m).
3. Connect the wire to the spark plug (Fig. 30).
Checking the Tire Pressure
Service Interval/Specification
Maintain the air pressure in the front and rear tires as
specified. Check the pressure at the valve stem after every
50 operating hours or monthly, whichever occurs first
(Fig. 32). Check the tires when they are cold to get the most
accurate pressure reading.
Pressure: 15 psi (103 kPa) rear tires
25–30 psi (172–207 kPa) caster tires
Figure 32
1. Valve stem
Cleaning the Cooling System
Service Interval/Specification
Before each use, check and clean the engine cooling
system. Remove any buildup of grass, dirt or other debris
from the cylinder and cylinder head cooling fins, air intake
screen on flywheel end, and carburetor-governor levers and
linkage. This will help ensure adequate cooling and correct
engine speed and will reduce the possibility of overheating
and mechanical damage to the engine.
Greasing and Lubrication
Service Interval/Specification
Grease the areas shown at the intervals given in the
Locating Where to Add Grease section below. Grease them
more frequently when operating conditions are extremely
dusty or sandy.
Grease with No. 2 general-purpose lithium-base or
molybdenum-base grease.
Applying the Grease
1. Disengage the blade control (PTO) lever and set the
parking brakes.
2. Clean the grease fittings with a rag and scrape any paint
from the front of the fitting(s).
3. Connect a grease gun to the fitting and pump grease
into the fittings until grease begins to ooze out of the
bearings.
4. Wipe up any excess grease.
Locating Where to Apply Grease
1. Lubricate the drive and caster wheel bearings and front
spindles (Fig. 33) after every 8 operating hours.
1
2. Lubricate the transmission couplers after every 100
operating hours and the idler bracket pivots after every
8 operating hours (Fig 34).
3. Lubricate the blade belt idler arm pivot (Fig. 35) after
every 50 operating hours.
30
m–3780
Figure 33
Figure 34
m–5389
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