Snapper S21, SP21, SPV21, SPV21S, SPV21E To adjust idler spring tension

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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.

4.3GROUND SPEED CONTROL ADJUSTMENT 4.3.1. IDLER SPRING TENSION ADJUSTMENT Correct idler spring tension assures that mower will achieve fastest attainable speed when ground speed control lover is placed in ‘FAST’ position.

1. Remove rear cover from mower. Refer to Section “Rear Cover Removal & Installation”.

2. Idler spring tension is adjusted properly when:

a. With lever in ‘SLOW’ position (see Figure 4.4), belt is relaxed, and idler spring on end of ground speed control cable has no extension. See Figure 4.6.

GROUND SPEED

LEVER IN ‘SLOW’

POSITION

SPRING HAS NO

TENSION

INNER NUT

OUTER NUT

BELT IS RELAXED

FIGURE 4.6

b. With lever in ‘FAST’ position (see Figure 4.4), belt is tight, and idler spring on end of ground speed control cable is extended approx. 1”. See Figure 4.7.

GROUND SPEED

UNEXTENDED

LEVER IN ‘FAST’

LENGTH

POSITION

1”

 

SPRING LENGTH

BELT IS TIGHT

EXTENDED 1”

 

FIGURE 4.7

To adjust idler spring tension:

Loosen outer nut on end of ground speed cable, and run inner nut in toward cable (clockwise) or out from cable (counterclockwise) by 1/2 turn increments until correct adjustments are attained. See Figure 4.6. Be sure to tighten outer nut.

3.Replace rear cover.

4.3.2.MINIMUM GROUND SPEED ADJUSTMENT If mower is traveling too fast or too slow when ground speed control lever is placed in ‘SLOW’ position, minimum ground speed can be adjusted. NOTE: Before adjusting minimum ground speed, be sure idler spring tension is adjusted correctly, as idler spring tension may affect minimum ground speed. Refer to Section “Idler Spring Tension Adjustment”.

1. Remove rear cover from mower. Refer to Section “Rear Cover Removal & Installation”.

2. Place ground speed control lever in ‘SLOW’ position. See Figure 4.4.

3. Adjust minimum ground speed:

To decrease minimum ground speed:

Remove end of idler spring from current adjustment hole, and relocate spring one hole closer to idler arm pivot bolt. See Figure 4.7a.

To increase minimum ground speed:

Remove end of idler spring from current adjustment hole, and relocate spring one hole farther from idler arm pivot bolt. See Figure 4.7a.

ADJUSTMENT

HOLES

INCREASE MINIMUM

GROUND SPEED

DECREASE MINIMUM GROUND SPEED

IDLER PIVOT BOLT

FIGURE 4.7a

NOTE: After adjusting minimum ground speed, readjustment of idler spring tension may be necessary.

4.Replace rear cover.

5.Check minimum ground speed; repeat adjustment as necessary.

THE DRIVE BELT ON THIS UNIT IS SUBJECT TO WEAR, AND SHOULD BE CHECKED REGULARLY. REPLACE A WORN, FRAYED OR DAMAGED BELT IMMEDIATELY.

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Contents ‘Easy Line’ Variable Speed Model Self Propelled Model Option Designation Cutting Width21 21 Cutting Width Swivel Front Wheels Electric Start From Previous Column Important Safety InstructionsDo not refuel the machine indoors From PreviousImportant Safety Instructions Table of Contents Nomenclature Model SPV21 Shown IntroductionEngine & Blade PRE-START Check List Starting & OperationHandle Height Adjustment Propelling Mower Self Propelled Models OnlyStopping To Remove Recycling Cover Cutting Height AdjustmentEach Notch Raises CUT Recycling OperationDoor Type Bag Installation of Side DischargeInstallation of Grass BAG DeflectorCheck Engine Drive Belt Service After First 5 Hours 3.2.1. Change Engine OILService Periodic Check Mower BladeStorage Procedure Blade Sharpening Mower Blade Replacement Standard Blade Wear LimitTop of transmission pulley removed for clarity Wheel Drive Control AdjustmentTo adjust idler spring tension To decrease minimum ground speedTo increase minimum ground speed Engine Drive Belt Replacement 1. Empty fuel tank Belt ServiceBattery Testing Battery Service NEW Battery PreparationBattery Service Battery StorageRear Cover Removal & Installation Problem Probable Cause Corrective Action TroubleshootingUSE HRS Season Service Performed EachMAINTENANCE/REPLACEMENT Parts 100Disclaimer of Warranty Year Limited WarrantyPrimary Maintenance Primary Maintenance Primary Maintenance Primary Maintenance Snapper Product Registration Form Page 21 ‘EASY LINE’ Walk Behind Mowers