Snapper S21, SP21, SPV21, SPV21S, SPV21E important safety instructions Repair & Adjustments

Section 4 - REPAIR & ADJUSTMENTS

WARNING

DO NOT attempt any maintenance, adjustments or service with engine and blade running. STOP engine and blade. Disconnect spark plug wire and secure away from spark plug. Engine and components are HOT. Avoid serious burns, allow sufficient time for all components to cool.

4.4BELT SERVICE

On self-propelled mowers, the engine belt transmits power from the engine to the transmission that powers the rear wheels. Should the belt become worn, it could cause slippage, which would impair mower performance. The condition of the engine belt should be checked after every 25 hours of mower operation.

4.4.1.Engine Drive Belt Replacement 1. Empty fuel tank.

2.Remove blade. Refer to Section “Blade Sharpening”.

3.Remove rear cover of mower. Refer to Section “Rear Cover Removal & Installation”.

4.SINGLE SPEED MODELS

a. Loosen (do not remove) engine mounting bolts securing belt guides, and swing belt guides out away from engine pulley. See Figure 4.8.

b. Replace belt, noting belt routing in Figure 4.8.

c. Replace belt guides, allowing approx 1/16” spacing between guides and belt. Torque engine mounting bolts to 40 ft-lbs.

d. Replace blade and rear cover.

5.VARIABLE SPEED MODELS

a. Loosen (do not remove) engine mounting bolts securing belt guides, and swing belt guides out away from engine pulley. Also loosen nut securing transmission belt guide, and swing guide back away from transmission pulley. See Figure 4.9.

b. Loosen (do not remove) nuts securing ground speed idler pulleys to idler plate to ease removal of belt. See Figure 4.9.

c. Replace belt, noting belt routing in Figure 4.9.

d. Replace belt guides, allowing approx 1/16” spacing between guides and belt. Torque engine mounting bolts to 40 ft-lbs. Retighten idler pulley bolts, making sure idler belt guide is aligned as shown in Figure 4.9. e. Replace blade and rear cover.

LOOSEN ENGINE

MOUNTING BOLTS;

SWING BELT GUIDES

AWAY FROM ENGINE

PULLEY

ENGINE	ENGINE
PULLEY
	PULLEY
WHEN REPLACING BELT
GUIDES, ALLOW 1/16”
SPACING BETWEEN BELT
GUIDE AND BELT	REPLACE
	DRIVE BELT
REPLACE
DRIVE BELT
	GROUND
	SPEED IDLER
SINGLE	VARIABLE
SPEED	SPEED
MODELS	MODELS
	TRANSMISSION
	PULLEY
	LOOSEN NUT; SWING
	BELT GUIDE AWAY
FIGURE 4.8	FROM TRANSMISSION
	PULLEY

LOOSEN

ENGINE

MOUNTING

BOLTS; SWING

BELT GUIDES

AWAY FROM

ENGINE

PULLEY

WHEN REPLACING BELT

GUIDES, ALLOW 1/16”

SPACING BETWEEN BELT

GUIDE AND BELT

LOOSEN (DO

NOT REMOVE)

THESE NUTS

TRANSMISSION

PULLEY

FIGURE 4.9

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