Craftsman 19HP BRIGGS & STRATTON WITH 42" MOWER 107.27768 Operator's Manual

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Contents

Check engine oil level

CHECK / ADJUST PTO CLUTCH• ILWARNINGTo avoid serious injury, perform adjustments onlywith engine stopped, key removed and tractor onlevel ground.Service interval: 200 Hours.The PTO clutch is engaged and disengaged by the PTOswitch. The clutch powers and brakes the mower blades.Check the PTO clutch adjustment every 200 hours ofoperation. Also perform the following procedure if theclutch is slipping, will not engage, or if a new clutch hasbeen installed.1. Remove key from ignition switch and disconnectspark plug wires to prevent the possibility of acciden-tal starting while the PTO is being adjusted.2. See Figure 22. Note the position of the 3 adjustmentwindows (A) in the side of the brake plate and thenylock adjustment nuts (B).3. Insert a .012"-.015" (2,5-4mm) feeler gauge (C)through each window, positioning the gauge betweenthe rotor face and the armature face as shown inFigure 23.4. Alternately tighten the adjustment nuts (B, Figure 22)until the rotor face and armature face just contactsthe gauge.5. Check the windows for an equal amount of tensionwhen the gauge is inserted and removed, and makeany necessary adjustments by tightening or loosen-ing the adjustment nuts.NOTE: The actual air gap between the rotor and arma-ture may vary even after performing the adjustment pro-cedure. This is due to dimensional variations on compo-nent parts, and is an acceptable condition.6. Check the mower blade stopping time. The mowerblades and mower drive belt should come to a com-plete stop within five seconds after the electric PTOswitch is turned off. If adjustment does not stop amower braking problem, replace the electric PTOclutch.Figure 22. PTO Clutch AdjustmentA. Adjustment Window (Qty. 3, one shown)B. Adjustment NutFigure 23. Adjust PTO ClutchA. WindowB. Adjustment NutC. Feeler Gauge22