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1
Figure 37
1. Center electrode insulator
2. Side electrode
Installing the Spark Plug
1. Install the spark plug(s) and metal washer. Make sure
the air gap is set correctly.
2. Tighten the spark plug(s) to 18 ft-lb (24 N.m).
3. Push the wire(s) onto the spark plug(s) (Fig. 36).
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. 38). 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 38
1. Valve
stem
3
0.025 in.
(0.65 mm)
3. Air gap (not to scale)
(s)
1
29
Cleaning the Cooling System
Service Interval/Specification
Before each use, check and clean engine cooling system.
Remove any build–up 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 insure 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 and at intervals in Where to Add
Grease section below. Grease more frequently when
operating conditions are extremely dusty or sandy.
Grease with No. 2 general purpose lithium base or
molybdenum base grease.
How to Grease
1. Disengage the blade control (PTO) and set the parking
brake.
2. Clean the grease fittings with a rag. Make sure to scrape
any paint off the front of the fitting(s).
3. Connect a grease gun to the fitting. Pump grease into
the fittings until grease begins to ooze out of the
bearings.
4. Wipe up any excess grease.
Where to Add Grease
1. Lubricate the drive and caster wheel bearings and front
spindles (Fig. 39). Lubricate every 8 hours.
Figure 39
2. Lubricate the transmission couplers every 100 hours
and idler arm pivots every 8 hours (Fig 40).
m–3780
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