Troy-Bilt Horse Tiller Operation Manual - Page 31

3. Using the 3⁄8" wrench, remove the drain plug. The gear oil will drain quite slowly since it is thick. After about two quarts have drained, tilt the tiller forward so any oil at the rear of the transmission will drain out. 4. Clean the drain plug threads, put non-hardening gasket sealant on the threads, and reinstall the plug. 5. Refill the transmission with the correct amount of gear oil before operating the tiller again. When oil seeps from the oil level check hole, the right amount of gear oil has been added. Replace all plugs. Adding Gear Oil to the Tine Attachment Transmission 1. Select the right Depth Regulator Lever setting: a. If filling an empty transmission, raise the Depth Regulator Lever so tines are on the ground. b. If topping off the gear oil, move Depth Regulator Lever down to engage its top notch. 2. Remove the dipstick from the tine attachment. See Fig. 6-6. 3. Slowly add gear oil in the dipstick hole. Add 1⁄2-ounce at a time to avoid overfilling. It takes about 12-1⁄2 ounces. 4. Take dipstick readings frequently. Stop when oil reaches "Cold" range marking on dipstick. Replace dipstick securely. Draining and Filling the Tine Attachment Transmission 1. The tine attachment transmission is not equipped with an oil drain plug. To drain just a small amount of gear oil, remove the dipstick and tilt the attachment forward, first uncoupling it from the Power Unit. 2. For complete drainage, remove the left-side tine assembly (See Tine Replacement in the Service section.), then remove just one of the lower screws from the tiller housing cover. See Fig. 6-9. To speed drainage, remove the tine attachment dipstick to vent transmission. 3. Once all the gear oil has drained, reinstall the housing cover screw securely (first coat its threads with non-hardening gasket sealant). 4. Be certain to refill the transmission with the correct amount of gear oil before operating the tiller again. Forward Interlock System The wiring circuit for the Forward Interlock Safety System is designed to ground out the engine's ignition system. There are three switches in the circuit which, when open, let the engine run. One switch is on the neutral plunger tab of the cast iron motor mount. This switch is open whenever the Wheels/ Tines/PTO Drive Lever is in NEUTRAL or REVERSE positions. The other two switches are located inside the handlebars, directly above the two Forward Interlock Levers. The switches are wired so when squeezed (open) the engine will run. There is a fourth switch located in the wiring harness connector on the top, right side of the transmission cover. It warns you if the connection is not mated by not letting the engine run while the Wheels/Tines/ PTO Drive Lever is in FORWARD. 1. A broken or disconnected wire could let the engine run without you having to press one of the Forward Interlock Levers. 2. A bare wire touching the tiller or engine metal could ground out the engine's ignition. 3. A switch that has failed allows the engine to run. Or it may prevent the engine from running. Lubrication Proper lubrication of the tiller's mechanical parts is an essential part of good maintenance. Lubrication should be done after every ten (10) hours of operation. Use ordinary motor oil (#30 weight or lighter) where oil is specified. Use a quality grease with a metal lubricant where grease is recommended (regular grease is acceptable). Do not over lubricate. If there is a build-up of dirt, remove the build-up and re-apply oil or grease. NOTE: Do not allow oil or grease to contact the pulleys, drive belt or reverse disc. This can cause the belt or disc to slip on the pulleys. Figure 6-9 NOTE: If you find a plastic washer on the cover screw you removed, discard the washer. There is no need to install a replacement washer. Section 6 - Maintenance & Adjustments 31