Briggs & Stratton 5900612, 5901186 Mower Belt Replacement, Troubleshooting, Adjustment & Service

Troubleshooting, Adjustment & Service

MOWER BELT REPLACEMENT

To avoid damaging belts, DO NOT

PRY BELTS OVER PULLEYS.

1.Park the tractor on a smooth, level surface such as a concrete floor. Disengage the PTO, engage the parking brake, turn off the engine, and remove the ignition key.

WARNING

Use extreme caution when rotating the idler arm with the breaker bar or combination wrench, due to the increased tension in the spring as the idler arm is being rotated. Injury may result if the breaker bar is prematurely released while the spring is under tension.

2.For 61” deck: Using a 1/2” breaker bar, place the square end in the square hole located in the end of the idler arm (A, Figure 45). Carefully rotate the breaker bar COUNTER-CLOCKWISE, which will relieve the tension on the belt exerted from the idler arm.

2.For 72” deck: Using a 3/4” combination wrench, place the box end on the nut (A, Figure 46) securing the idler pulley located in the end of the idler arm. Carefully rotate the wrench CLOCKWISE, which will relieve the tension on the belt exerted from the idler arm.

3.Slide the drive belt over the edge of the stationary idler pulley (B). Carefully release the tension on the breaker bar or combination wrench until the idler arm comes to a stop.

4.Remove the old belt and replace with a new one. Make sure the V-side of the belt runs in the pulley grooves (Figure 47).

5.For 61” deck: Install the drive belt on the PTO pulley, the spindle pulleys and all idler pulleys except the stationary pulley (B, Figure 45).

Carefully rotate the breaker bar COUNTER- CLOCKWISE and install the belt on the stationary idler pulley (B). Carefully release the tension on the breaker bar.

5.For 72” deck: Install the drive belt on the PTO pulley, the spindle pulleys and all idler pulleys except the stationary pulley (B, Figure 45).

Carefully rotate the combination wrench CLOCKWISE and install the belt on the stationairy idler pulley (B). Carefully release the tension on the combination wrench.

6.Run the mower under no-load condition for about 5 minutes to break-in the new belt.

A

B

Figure 45. Mower PTO Belt (61” Mower Deck)

A.Idler Arm

B.Stationary Idler Pulley

B

A

Figure 46. Mower PTO Belt (72” Mower Deck)

A.Nut

B.Stationary Idler Pulley

D	B	C	Troubleshooting
A			A
		D
D
	A

Figure 47. Mower PTO Belt Routing

A.Spindle Pulley

B.PTO Drive Belt

C.Spring-loaded Idler Pulley

D.Stationary Idler Pulley

45