Belt Service | Snapper S21, SP21, SPV21, SPV21S, SPV21E instruction

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	ENGINE
	PULLEY	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