Briggs & Stratton PTO Clutch Adjustment, Blade Brake Check, A. Window, To avoid seri us, B. Adjustment Nut, B. Adjustment Nut, nly with eng ne st, rider on level gr und

Troubleshooting, Adjustments, & Service

B		A
	B	B

		C
		Figure 37. Adjust PTO Clutch
B	A	A. Window
		B. Adjustment Nut
		C. .016”-.018” (0,40-0,45mm) Feeler Gauge

Figure 36. PTO Clutch AdjustmentA. Adjustment Window (Qty. 3, one shown)

B. Adjustment Nut

PTO Clutch Adjustment				WARNING
Check the PTO clutch adjustment after every 100
			To avoid seri us i		jury, perform adjustments
hours of operation. Also perform the following
			nly with eng ne st		pped, key removed and
procedure if the clutch is slipping or will not engage,		r
			rider on level gr und.
if a new clutch has been installed.
1. Remove key from ignition switch and disconnect		for
spark plug wires to prevent the possibility f
			Blade Brake Check
accidental starting while the PTO is being
			Mower blades and mower drive belt should come to
adjusted.
2. See Figure 38. Note the position of the 3			a complete stop within five (5) seconds after electric
			PTO switch is turned off.
adjustment windows (A) in the side of the b ake
	Not		1. With parking brake engaged, PTO disengaged and
plate and the nylock adjustment nuts (B).
3. Insert a .016”-.018” (0,40-0,45mm) feeler gauge			an operator in the seat, start the engine engine.
(C) through each window, positioning the gauge			2. Have an assistant observe the mower drive belt
between the rotor face and the armature face as			through the opening between the frame and top of
shown in Figure 36.			mower deck. Engage the PTO and wait several
4. Alternately tighten the adjustment nuts (B, Figure			seconds. Disengage the PTO and check the
			amount of time it takes for the mower drive belt to
38) until the rotor face and armature face just
			stop.
contacts the gauge.
	Reproduction3. If the mower drive belt does not stop within five (5)
5. Check the windows for an equal amount of tension

when the gauge is inserted and removed, and	seconds, perform the PTO Clutch Adjustment. If
	the belt still does not stop within five (5) seconds,
make any necessary adjustments by tightening or
	see your dealer.
loosening the adjustment nuts.

NOTE: The actual air gap between the rotor and armature may vary even after performing the adjustment procedure. This is due to dimensional variations on component parts, and is an acceptable condition.

6.Check the mower blade stopping time. The mower blades and mower drive belt should come to a complete stop within five (5) seconds after the electric PTO switch is turned off.

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