Walker B18 Operator's Manual

54Maintenance Instructions CHECKING/SERVICINGPTO U-JointsThe PTO U-joints should be inspected yearly forlooseness and wear. If either is noticed, the respec-tive shaft or tube should be replaced. A worn U-jointcan cause vibration and extensive damage to thePTO and the whole machine.Ignition WiresGood preventive maintenance calls for completereplacement of spark plug wires every two (2)years.Safety Switch SystemWARNINGIt is important to check and maintain thesafety switch system for safe operation ofthe machine.There are three (3) safety interlock switches on thetractor; Seat Switch, FSC Neutral-Park Switch, andPTO Switch.If any of the following conditions occur during start-ing or operating, a safety interlock switch may bemalfunctioning. Contact your Walker dealer for trou-bleshooting and/or replacement.• With or without an operator in the seat, the enginestarts with the Forward Speed Control (FSC) and/orthe PTO engaged.• With an operator in the seat, the engine starts butdies soon after the Forward Speed Control (FSC) orPTO is engaged.• Without an operator in the seat, the engine con-tinues to run with the Forward Speed Control (FSC)and/or PTO engaged.• With an operator in the seat, the Forward SpeedControl (FSC) and PTO disengaged, but the starteris not engaging.Forward Speed Control Friction LockThe FSC friction lock is designed to hold the se-lected forward travel speed when the steering le-vers are moved and yet the friction is not too heavyto make moving the FSC control difficult (too muchfriction). The procedure for checking the FSC fric-tion lock is as follows:1. With the engine off, place the FSC in the fullFORWARD position and pull both steering le-vers back; the FSC lever should not move. Ifthe FSC lever moves back when the steeringlevers are pulled back, the friction needs to beincreased.2. With the steering levers held back, move theFSC lever back from the FORWARD position.With a proper amount of friction adjusted, theFSC lever should move back with a slightamount of resistance (friction). If the FSC levermovement is “stiff”, the friction needs to bedecreased.If the FSC friction lock needs to be adjusted, refer toADJUSTMENTS for Step 7 - Forward Speed Con-trol Friction Adjustment in this section.