Cub Cadet RT 75 Shop Manual
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Cub Cadet RT 75 Shop Manual

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See also: Operator's Manual
NOTE: These materials are for use by trained technicians who are experienced in the service and repair of outdoor power
equipment of the kind described in this publication, and are not intended for use by untrained or inexperienced individuals.
These materials are intended to provide supplemental information to assist the trained technician. Untrained or inexperi-
enced individuals should seek the assistance of an experienced and trained professional. Read, understand, and follow all
instructions and use common sense when working on power equipment. This includes the contents of the product's Oper-
ators Manual, supplied with the equipment. No liability can be accepted for any inaccuracies or omission in this publication,
although care has been taken to make it as complete and accurate as possible at the time of publication. However, due to
the variety of outdoor power equipment and continuing product changes that occur over time, updates will be made to these
instructions from time to time. Therefore, it may be necessary to obtain the latest materials before servicing or repairing a
product. The company reserves the right to make changes at any time to this publication without prior notice and without
incurring an obligation to make such changes to previously published versions. Instructions, photographs and illustrations
used in this publication are for reference use only and may not depict actual model and component parts.
RT 75 Rear Tine Tiller
© Copyright 2013 MTD Products Inc. All Rights Reserved
Professional Shop Manual
Professional Shop Manual

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Summary of Contents for Cub Cadet RT 75

  • Page 1 Professional Shop Manual Professional Shop Manual RT 75 Rear Tine Tiller NOTE: These materials are for use by trained technicians who are experienced in the service and repair of outdoor power equipment of the kind described in this publication, and are not intended for use by untrained or inexperienced individuals.

  • Page 3: Table Of Contents

    The RT 75 Series Tiller ........

  • Page 5: Chapter 1: Introduction

    Introduction CHAPTER 1: INTRODUCTION Professional Service Manual Intent: This manual is intended to provide service dealers with repair and overhaul procedures for the RT&% series tiller. Disclaimer: The information contained in this manual is correct at the time of writing. Both the product and the infor- mation about the product are subject to change without notice.
  • Page 6 RT 75 • Be prepared in case of emergency: ! CAUTION ! CAUTION Keep a fire extinguisher nearby Keep a first aid kit nearby Keep emergency contact numbers handy • Replace any missing or damaged safety labels on shop equipment.

  • Page 7: Fasteners

    Introduction Fasteners • The fasteners used on the equipment described in this manual, and the engine that powers it are a combi- nation of metric and fractional inch. For this reason, wrench sizes are frequently identified in the text, and measurements are given in U.S.

  • Page 8: Understanding Model And Serial Numbers

    A neutral lever to disengage the transmission. Figure 1.1 Understanding model and serial numbers The model number of the RT 75 tiller described in this manual is 21AC482R710. The break down of what the model number means is as follows: •...

  • Page 9: Maintenance Chart

    Introduction Maintenance chart Maintenance item Each use Each 25 hrs. use Each 50 hrs. use Check engine oil Check air filter Check transmission oil Check for loose/broke tines Check & gap spark plug Replace if worn Check cooling fins After prolonged storage Check/clean spark arrestor Change oil Note on oil:...
  • Page 10 RT 75...

  • Page 11: Chapter 2: Belts

    Belts CHAPTER 2: BELTS The RT 75 tiller has two belts; a forward drive belt and a reverse belt. Both belts have to come off together. MTD recommends replacing both belts at the same time. To remove/replace the belts: Disconnect and ground the spark plug wire.
  • Page 12 RT 75 Remove the four screws that secure the transmis- sion pulley shield using a 3/8” wrench. See Figure 2.3. NOTE: The tire was removed for this picture. It is not required to remove the tire to remove the belts.
  • Page 13 Belts 12. Remove the nut that secures the transmission pulley using a 7/8” socket and an impact wrench. See Figure 2.6. 7/8” nut 13. Slide the transmission pulley and both belts off together. Figure 2.6 forward drive belt reverse belt 14.
  • Page 14 RT 75 Reverse drive belt Forward drive belt Engine Pulley Transmission pulley Belt Routing...

  • Page 15: Chapter 3: Cables

    CHAPTER 3: CABLES The RT 75 tiller has a forward drive cable and a reverse drive cable. The forward drive cable is actuated by a bail that the operator squeezes. The reverse drive cable is actuated by a lever. See Figure 3.1.

  • Page 16: Forward Drive Cable

    RT 75 Forward drive cable To remove/replace the forward drive cable: Disconnect and ground the spark plug wire. Disconnect the black cable fitting from the handle bar bracket. See Figure 3.3. NOTE: A ford fuel line tool is useful to compress the ears on the cable fitting while removing it.
  • Page 17 Cables Loosen, but do not remove, the screw securing the cable pulley. See Figure 3.6. Disconnect this cable Slip the cable off of the pulley. Disconnect the black cable fitting from the cable bracket. See Figure 3.6. Loosen this screw Figure 3.6 Unhook the spring end of the cable from the forward idler bracket.

  • Page 18: Reverse Drive Cable

    RT 75 Reverse drive cable Disconnect the To remove the reverse drive cable: cable fitting Disconnect and ground the spark plug wire. Disconnect the red cable fitting from the handle bar bracket. See Figure 3.8. Unhook the Z-fitting from the reverse drive lever.
  • Page 19 Cables Disconnect the red cable fitting from the cable bracket. See Figure 3.11. Disconnect Disconnect the cable Z-fitting. this cable Install the reverse cable by following the previous steps in reverse order. Test run the tiller in a safe area before returning it to service.
  • Page 20 RT 75...

  • Page 21: Chapter 4: Engine

    CHAPTER 4: ENGINE At the time this manual was written, a Briggs and Stratton engine was the only engine option for the RT 75 tiller. If a different brand of engine is used, the removal/replacement procedures will be essentially the same.
  • Page 22 RT 75 Slide the forward drive belt off of the engine pulley. Loosen the nut and bolt that secures the reverse reverse idler idler pulley to the idler bracket, using a pair of 7/16” pulley wrenches. See Figure 4.3. Slide the reverse belt past the belt guards and off of the idler pulley.
  • Page 23 Engine motor cover plate 15. Transfer the engine pulley, reverse idler bracket and the motor cover plate to the new engine. See Figure 4.6. engine pulley reverse idler bracket Figure 4.6 NOTE: If the idler pulley was removed from the idler bracket, it must be reassembled so that the spot welds face away from the idler bracket to ensure proper belt alignment.
  • Page 24 RT 75...

  • Page 25: Chapter 5: Transmission Removal

    Transmission Removal CHAPTER 5: TRANSMISSION REMOVAL Transmission removal Loosen screw and slide cable off of the pulley Remove the belts by following the procedures described in Chapter 2: Belts. Remove the engine by following the steps described in Chapter 4: Engine Removal. Loosen the forward drive cable pulley, using a 3/8”...
  • Page 26 RT 75 Unhook the idler bracket spring. See Figure 5.3. idler bracket spring Figure 5.3 Remove the wheels. Support the wheel shafts with wood blocks. See Figure 5.4. NOTE: Any time the wheels are removed, or once a year, the wheel shafts should be coated with anti- seize or grease.
  • Page 27 Transmission Removal Disconnect the front of the drag bar, using a 5/8” wrench and a 1/2” wrench. See Figure 5.6. Remove nut and bolt Drag bar Figure 5.6 handle mount nuts and bolts 10. Remove the four screws that hold the frame rails to the transmission, using a 1/2”...
  • Page 28 RT 75 Lift the frame, handle bar and tine shield off as one unit. See Figure 5.9. Figure 5.9 Remove the tines: 14a. Remove the bow tie clip and clevis pin. See Figure 5.10. 14b. Slide the tines off of the shaft.
  • Page 29 Transmission Removal 15. Remove the idler bracket, using a 1/2” wrench. See Figure 5.12. 16. Install the transmission by following the previous steps in reverse order. 17. Test run the tiller in a safe area before returning it to service. idler bracket Figure 5.12...
  • Page 30 RT 75...

  • Page 31: Chapter 6: Transmission Overhaul

    Transmission Overhaul CHAPTER 6: TRANSMISSION OVERHAUL The 460 series transmission is equipped with a neutral feature that will disengage the wheel shaft from the trans- mission. This allows the tiller to be pushed without the engine driving it. The neutral mechanism is a dog clutch that is splined to the wheel shaft.
  • Page 32 RT 75 Remove the retaining ring that secures the right wheel shaft bearing, using a pair of snap ring pliers. Remove the eight screws that secure the side cover to the transmission housing, using a 3/8” wrench. See Figure 6.3.
  • Page 33 Transmission Overhaul 15. Remove the four hex flange screws holding the rear transmission cover to the transmission housing, using a 1/2” wrench. See Figure 6.6. 16. Wedge a sharp 5-in-1 painters tool or putty knife in between the cover and the transmission housing. 17.
  • Page 34 RT 75 Drive the tine shaft to the left, forcing the left tine shaft bearing out of the transmission housing. If the bearing is stuck, use a block of wood and a large hammer. NOTE: The washer will be damaged by the Hi-Pro key.
  • Page 35 Transmission Overhaul 33. Measure the overall thickness of the rear bearing shims using a dial caliper. See Figure 6.11. 34. Record the measurement for future reference. Figure 6.11 Front bearing 35. Inspect the rear tapered roller bearing assembly for damage or wear. 36.
  • Page 36 RT 75 Worm gear Slide the shifter fork out of the dog clutch collar. Snap ring Snap ring Remove the snap ring that retains the spring and washer, using a pair of snap ring pliers. Slide the washer, spring, and the dog clutch collar off of the wheel shaft.

  • Page 37: Transmission Assembly

    Transmission Overhaul Transmission assembly Dial Caliper Thoroughly clean the entire transmission housing. Clamp the transmission housing in a soft jawed vice. Make certain all the drive shaft components are accounted for. Locate both hex flange screws that were securing the hood bracket to the transmission assembly.
  • Page 38 RT 75 Snap ring grooves Assemble the wheel shaft and the neutral assembly. 10a. In the middle of the wheel shaft there is a sec- tion that is splined. On one side of the splines there are two snap ring grooves. On that side, install a snap ring in the grove closest to the splines.
  • Page 39 Transmission Overhaul 10e. Slide the spring onto the wheel shaft so that it Washer Spring is next to the clutch collar. 10f. Slide the washer onto the wheel shaft so that it is against the spring. 10g. Install the third snap ring while compressing the spring and washer.
  • Page 40 RT 75 Install the tine shaft. It will pass through the bearing bore, through the tine shaft worm gear and out the other side of the transmission. Snap ring Slide the Hi-Pro key into the tine shaft worm gear. On each side, slide the washer over the tine shaft.
  • Page 41 Transmission Overhaul Magnetic Base 32. Shim the rear drive shaft bearing to set the drive shaft end play to 0.005” - 0.015” (0.13 -. 038 mm). Drive Shaft 32a. Set up a dial indicator at the front of the drive shaft.
  • Page 42 RT 75 Secure the rear bearing cap to the transmission assembly with the hex flange screws with the washers used earlier, using a 1/2” wrench. NOTE: Tighten the hex screws to a torque of 100 in lbs (11 Nm). NOTE: Leave the two top screws in place until the sealant has cured. Then they should be removed.

  • Page 43: Chapter 7: Tines

    Tines CHAPTER 7: TINES Tines The RT 75 tiller is a counter rotating tiller equipped with Euro tines. If the tines are properly installed, the tines will Euro tines cut into the ground and break up the soil. If the tines are installed backwards, the tines will “hammer”...
  • Page 44 RT 75 Remove the tine hood end cover and the side shield. See Figure 7.3. Figure 7.3 Remove the tine assemblies by removing the clevis pin and bow tie clip that secures the tine assemblies to the tine shaft on the transmission.
  • Page 45 Tines Right Hand Tine Right Hand Tine Left Hand Tine Left Hand Tine Right Hand Tine Left Hand Tine NOTE: When installing the tines, it is important that the correct tines are used and they are installed in the proper orientation. To determine which tine is right or left: 5a.
  • Page 46 RT 75 clevis pin Apply anti-seize to the tine shaft. Installing the assembly. When correctly installed: • The end of the tine holder with the clevis pin hole should face towards the transmission. • The outside tines should curve inward •...

  • Page 47: Chapter 8: Swivel Handle

    Swivel Handle CHAPTER 8: SWIVEL HANDLE Handle bar To remove/replace the handle bar: Disconnect the forward and reverse cables from the handle bar, by following the procedures described in Chapter 3: Cables. Remove the nut and bolt that secures the throttle lever to the handle bar, using a pair of 7/16”...
  • Page 48 RT 75 Remove and discard both of the cable ties from the handle bar. See Figure 8.3. cable ties Figure 8.3 inner cotter pin Remove and discard the outer cotter pin that outer cotter pin secures the swivel rod to the swivel latch. See Fig- ure 8.4.
  • Page 49 Swivel Handle nut retension bracket NOTE: There is a nut retension bracket on the left side of the handle bar swivel mount. When the handle mounting nut and bolt is removed, the bracket and the upper nut will fall off. See Figure 8.6. Remove the handle mounting nut and bolt.

  • Page 50: Swivel Bracket

    RT 75 Swivel Bracket To rebuild the swivel assembly: Remove the handle bar assembly, by following the procedures described in the previous section of this upper jam lock nut chapter. NOTE: It is advisable to rebuild the swivel assembly on the machine. Having the lower bracket mounted to the frame provides stability while torquing the lower nut.
  • Page 51 Swivel Handle Remove the Belleville washer. See Figure 8.10. Belleville washer Figure 8.10 Remove the nut and bolt that the swivel latch and spring pivot on, using a pair of 9/16” wrenches. See swivel latch Figure 8.11. Remove the swivel latch and spring. Lift the upper swivel latch bracket off of the machine.
  • Page 52 RT 75 Torque to Install the upper swivel bracket. 240 - 270 in lbs Install the swivel latch and spring. Install the Belleville washer. locking jam nut Belleville Install the lower nut and tighten it to a torque of 240 washer - 270 in lbs (27 - 31 Nm).
  • Page 54 MTD Products Inc - Product Training and Education Department FORM NUMBER - 769-09590-00 12/2013...

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