MTD 450 Series Shop Manual
  1. Manuals
  2. Brands
  3. MTD Manuals
  4. Tiller
  5. 450 Series
  6. Shop manual
MTD 450 Series Shop Manual

MTD 450 Series Shop Manual

Hide thumbs Also See for 450 Series:
Table of Contents

Advertisement

Quick Links

See also: Service Manual , Operator's Manual
For Parts Call 606-678-9623 or 606-561-4983
Professional Shop Manual
450 Series 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.
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.
© Copyright 2010 MTD Products Inc. All Rights Reserved
MTD Products Inc - Product Training and Education Department
FORM NUMBER - 769-06021
11/2010
www.mymowerparts.com

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the 450 Series and is the answer not in the manual?

Questions and answers

Related Manuals for MTD 450 Series

Summary of Contents for MTD 450 Series

  • Page 1 Instructions, photographs and illustrations used in this publication are for reference use only and may not depict actual model and component parts. © Copyright 2010 MTD Products Inc. All Rights Reserved MTD Products Inc - Product Training and Education Department...
  • Page 2 For Parts Call 606-678-9623 or 606-561-4983 www.mymowerparts.com...

  • Page 3: Table Of Contents

    For Parts Call 606-678-9623 or 606-561-4983 Table of Contents Chapter 1: Introduction 1 About the text format ......... . . 1 Safety .
  • Page 4 For Parts Call 606-678-9623 or 606-561-4983 www.mymowerparts.com...

  • Page 5: Chapter 1: Introduction

    • Common sense in operation and safety is assumed. • In no event shall MTD be liable for poor text interpretation, or poor execution of the procedures described in the text. • If the person using this manual is uncomfortable with any procedures they encounter, they should seek the help of a qualified technician.

  • Page 6: Safety

    For Parts Call 606-678-9623 or 606-561-4983 450 Series Tillers Safety This Service Manual is meant to be used along with the Operator’s Manual. Read the Operator’s Manual and familiarize yourself with the safety and operational instructions for the equipment being worked on. Keep a copy of the Operator’s Manual for quick reference.

  • Page 7: Fasteners

    For Parts Call 606-678-9623 or 606-561-4983 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

    16” ag tires Figure 1.1 Understanding model and serial numbers The model number of a the 450 series tiller described in this manual is 21AA453B000. The break down of what the model number means is as follows: • 21 - - - - - - - - - - - - - - -indicates that this is a tiller •...

  • Page 9: Maintenance Chart

    For Parts Call 606-678-9623 or 606-561-4983 Introduction Maintenance chart Maintenance item Each use Each 25 hrs. use Each 50 hrs. use Check engine oil Check air filter Check for loose/broke tines Check & gap spark plug Replace if worn Check cooling fins After prolonged storage Check/clean spark arrestor Change oil...
  • Page 10 For Parts Call 606-678-9623 or 606-561-4983 450 Series Tillers www.mymowerparts.com...

  • Page 11: Chapter 2: Clutch And Controls

    For Parts Call 606-678-9623 or 606-561-4983 Clutch and Controls CHAPTER 2: CLUTCH AND CONTROLS Clutch Operation Pulling the clutch control bale toward the handlebar pulls the clutch cable. Input pulley The clutch cable draws an idler pulley against the bottom of a belt that runs from the engine crankshaft pulley to the input pulley of the chain case.

  • Page 12: Belt Replacement

    For Parts Call 606-678-9623 or 606-561-4983 450 Series Tillers Belt Replacement IMPORTANT: If the belt has failed prematurely, identify and correct the cause of the failure before installing the replacement belt. Conditions that might cause early belt failure include: Use of the wrong size or type of belt.
  • Page 13 For Parts Call 606-678-9623 or 606-561-4983 Clutch and Controls Belt keeper Loosen the idler pulley using a pair of 9/16” wrenches. See Figure 2.5. Slip the belt from between the idler pulley and the keeper. Remove the V-belt from around the large input pulley, and lift it off the tiller.

  • Page 14: Pulley Alignment And Travel

    For Parts Call 606-678-9623 or 606-561-4983 450 Series Tillers Pulley alignment and travel If there is question about pulley alignment, a straight-edge may be used to check them. Input pulley removal: See Figure 2.6. Put the chain case in Neutral and rotate the Input shaft input pulley to make a visual check for run-out.

  • Page 15: Idler Pulley Bracket Removal

    For Parts Call 606-678-9623 or 606-561-4983 Clutch and Controls Idler Pulley Bracket Removal Remove the belt as described in the Belt Removal section of this chapter. Remove the input pulley from the chain case input shaft using a 7/16” wrench. Selecting one of the Idler pulley gears that engages wheels and tines will help keep bracket...

  • Page 16: Replacing And Adjusting The Clutch Cable

    For Parts Call 606-678-9623 or 606-561-4983 450 Series Tillers Replacing and Adjusting the Clutch Cable Loosen the jam nut that locks the ferrule at the top Jam nut end of the clutch control cable to the threaded eye. The ferrule can be held with a 1/4” wrench and the nut can be turned with a 3/8”...
  • Page 17 For Parts Call 606-678-9623 or 606-561-4983 Clutch and Controls Loosen the jam nuts that hold the bottom end of the cable to the cable bracket on the chain case. This can be done using a pair of 1/2” wrenches. See Figure 2.15. Jam nuts Thread the bottom nut all the way off of the cable housing.

  • Page 18: Clutch Cable Adjustment

    For Parts Call 606-678-9623 or 606-561-4983 450 Series Tillers Clutch Cable Adjustment Position the tiller so that the counterweight on the front is against a solid object that will not move under the drive force of the tiller. Confirm that operating the tiller will not create any unsafe conditions before starting the...

  • Page 19: Shift Lever And Rod

    On 450 Series tiller produced before the 2010 pro- duction season, the shift crank/pointer has a straight bore, and is held to the shift fork by a roll pin. To remove it: See Figure 2.20.
  • Page 20 For Parts Call 606-678-9623 or 606-561-4983 450 Series Tillers 2010 and later Current production 450-Series tillers include a plas- Plastic cap shift crank/ tic cap on top of the shift crank/pointer to help pointer exclude rainwater from the chain case.

  • Page 21: Chapter 3: Engine

    For Parts Call 606-678-9623 or 606-561-4983 Engine CHAPTER 3: ENGINE There are a veriaty of engines available for the 450 series tiller. Regardless of the brand of engine that is used, the removal/replacement procedures will be the same. Engine removal To remove/replace the engine: Disconnect and ground the spark plug wire.

  • Page 22: Engine Installation

    For Parts Call 606-678-9623 or 606-561-4983 450 Series Tillers Engine installation Carefully place the engine on the tiller and line the bolt holes on the engine and frame NOTE: A 3/8” drift can be used to line the holes in the base of the engine to the frame.

  • Page 23: Chapter 4: Transmission Removal

    For Parts Call 606-678-9623 or 606-561-4983 Transmission Removal CHAPTER 4: TRANSMISSION REMOVAL Support the front counterweight with a 4X4 or a suit- able jack stand. See Figure 4.1. NOTE: The purpose of the counter weight is to provide stability to the tiller during operation. NOTE: The counter weight tips the scale at 35lbs + / - 2lbs.
  • Page 24 For Parts Call 606-678-9623 or 606-561-4983 450 Series Tillers Remove the engine by following the procedures described in Chapter 3: Engine. Remove the spiral pin securing the indicator bracket to the shift lever using a 3/16” pin punch and ham- mer.
  • Page 25 For Parts Call 606-678-9623 or 606-561-4983 Transmission Removal 11. Remove the clutch control cable from the eyebolt by loosening the top nut to release the tension on lower nut using a 1/2” wrench. See Figure 4.6. NOTE: The lower jam nut needs to be completely threaded off in order to slip the cable off of the bracket.
  • Page 26 For Parts Call 606-678-9623 or 606-561-4983 450 Series Tillers Remove both hex cap screws and flange lock nuts from each side of the handle bracket by using a1/2" 1/2” wrench and 9/16” wrench. See Figure 4.9. NOTE: The 1/2” wrench is used on the top of the tine cover and the 9/16”...
  • Page 27 For Parts Call 606-678-9623 or 606-561-4983 Transmission Removal 24. Remove the nut and bolts securing the wheel assem- blies to the wheel shaft with a pair of 7/16” wrenches. See Figure 4.12. NOTE: Lubricate the wheel shaft during re-assembly. 25. Remove both wheel assemblies. 26.
  • Page 28 For Parts Call 606-678-9623 or 606-561-4983 450 Series Tillers www.mymowerparts.com...

  • Page 29: Chapter 5: Chain Case

    For Parts Call 606-678-9623 or 606-561-4983 Chain Case CHAPTER 5: CHAIN CASE About this chapter This chapter covers operation and internal servicing of the chain case. Before opening the chain case, review the troubleshooting section of this chapter to identify the most likely problem. Do not disassemble the chain case to look for an internal problem without first eliminating all of the external possibilities.

  • Page 30: Wheels Reverse

    For Parts Call 606-678-9623 or 606-561-4983 450 Series Tillers Wheels Reverse Input spur gear Shift fork The shift arm pushes the shift fork all the way down. Shift arm The shift fork pushes the input spur gear all the way down the input shaft.

  • Page 31: Wheels Forward

    For Parts Call 606-678-9623 or 606-561-4983 Chain Case Wheels Forward If the operator moves the control lever one notch up from the Neutral position, the shift fork will move to the next detent up from Neutral. The shift fork will raise the input spur gear to a point where the upper set of teeth engage only the lower half of the paired wheel drive and tine drive gears on the main shaft.

  • Page 32: Counter Rotation Tilling

    For Parts Call 606-678-9623 or 606-561-4983 450 Series Tillers Counter Rotation Tilling Tine drive gear and sprocket NOTE: Counter rotation tilling means the tines turn the opposite direction of the wheels If the operator moves the control lever one notch back from the wheels forward position, the shift fork will raise the input spur gear to the next detent.

  • Page 33: Standard Rotation Tilling

    For Parts Call 606-678-9623 or 606-561-4983 Chain Case Standard Rotation Tilling Input spur gear NOTE: Standard rotation tilling means the tines turn the same direction as the wheels If the operator moves the control lever one notch back from the Counter Rotating Tines position, the shift fork will raise the input spur gear to the top detent.

  • Page 34: Chain Case Separation

    For Parts Call 606-678-9623 or 606-561-4983 450 Series Tillers Chain Case Separation Place the chain case on blocks or a fixture so that it is stable and does not rest on the tine shaft or axle shaft. The input pulley should face up.
  • Page 35 For Parts Call 606-678-9623 or 606-561-4983 Chain Case Self tapping Gear positioning screws 10. Remove the shoulder nut that holds the idler bracket bracket to the main shaft using a 7/8” wrench. Counter 11. Remove the idler bracket assembly. See Figure 5.14. shaft Idler bracket assembly...
  • Page 36 For Parts Call 606-678-9623 or 606-561-4983 450 Series Tillers Insert a putty knife or scraper between the two case halves and work around the perimeter of the gear case until all sealant has been broken free. See Figure 5.17. NOTE: If there is dirt or corrosion on the shafts it may be necessary to clean the shaft using emery cloth.
  • Page 37 For Parts Call 606-678-9623 or 606-561-4983 Chain Case 21. Check inside the removed housing for washers and spacers that may be stuck in the grease. Identify the correct placement and orientation of these parts before proceeding. 22. Take an initial look in the case for any obvious prob- lems: (it may be necessary to remove grease for bet- ter visibility) •...

  • Page 38: Wheel Axle And Wheel Speed Reduction Shaft

    For Parts Call 606-678-9623 or 606-561-4983 450 Series Tillers Wheel Axle and wheel speed reduction shaft The wheel axle is easy to lift out of the chain case: Reduction There is a washer between the sprocket and the gear and upper half of the chain case housing.
  • Page 39 For Parts Call 606-678-9623 or 606-561-4983 Chain Case Notice the orientation of the spacer and the axle: Washer Spacer Weld bead See Figure 5.25. • One side of the axle has a weld bead where the shaft is attached to the sprocket, the other side is flat.
  • Page 40 For Parts Call 606-678-9623 or 606-561-4983 450 Series Tillers Hydraulic ram Press or drive the replacement bearing into the hous- ing using an appropriate size arbor or driving tool that Arbor (socket) will not damage the thrust surface of the bearing.

  • Page 41: Tine Shaft

    For Parts Call 606-678-9623 or 606-561-4983 Chain Case Tine Shaft Tine shaft There is a washer between the sprocket and the Main shaft upper half of the chain case housing. It may be on Washers the tine shaft, or it may have come off with the upper housing.
  • Page 42 For Parts Call 606-678-9623 or 606-561-4983 450 Series Tillers Tine shaft Notice the orientation of the spacer and the tine shaft: Washer See Figure 5.33. Sprocket • One side of the tine shaft has a weld bead where the shaft is attached to the sprocket, the other side is flat.
  • Page 43 For Parts Call 606-678-9623 or 606-561-4983 Chain Case Spacer (recess fits NOTE: When putting the chain case back together, leave over weld bead) the main shaft loose until the tine shaft, chain, and sprocket are installed. It is best to leave the shaft loose until the case halves are back together to ensure proper shaft alignment.

  • Page 44: Main Shaft Assembly

    For Parts Call 606-678-9623 or 606-561-4983 450 Series Tillers Main Shaft Assembly Tine shaft, chain and sprocket Remove the tine shaft and the top gear (tine drive removal gear) from the main shaft, as described in the Tine Shaft Assembly section of this chapter.
  • Page 45 For Parts Call 606-678-9623 or 606-561-4983 Chain Case Lift the washer off of the main shaft. See Figure 5.40. Lift the wheel gear off of the main shaft. Main shaft Tine drive gear Washer Wheel drive gear Wheel drive gear Figure 5.41 Figure 5.40 Wheel drive...
  • Page 46 For Parts Call 606-678-9623 or 606-561-4983 450 Series Tillers If the main shaft needs to be removed, double-nut the shaft so that it can be held with a wrench, then remove the nut and Belleville washer from the bottom of the main shaft using an 11/16” wrench.

  • Page 47: Counter Shaft

    For Parts Call 606-678-9623 or 606-561-4983 Chain Case Counter shaft There is a washer between the top gear and the upper half of the chain case housing. It may be on the axle shaft, or it may have come off with the upper housing.
  • Page 48 For Parts Call 606-678-9623 or 606-561-4983 450 Series Tillers With the counter shaft removed, the bottom gear (wheels reverse drive) and the washer that fits beneath it can be maneuvered out of the housing. See Figure 5.48. Assembly Tip: Note the orientation of the counter shaft in the chain case housing: •...

  • Page 49: Detent Shaft

    For Parts Call 606-678-9623 or 606-561-4983 Chain Case Detent shaft Input spur gear Detent shaft The detent shaft assembly can be lifted out of the chain case housing in tandem with the input pinion. See Figure 5.50. As the detent shaft, shift fork, spacer (below shift fork) and input pinion slide up the shift arm, it can be disengaged from the shift fork.

  • Page 50: Input Shaft

    For Parts Call 606-678-9623 or 606-561-4983 450 Series Tillers Input shaft Shift arm Bottom gear on Remove the input spur gear and detent shaft assem- counter shaft bly as described in the Detent Shaft section of this (over-hangs bearing) chapter. See Figure 5.53.
  • Page 51 For Parts Call 606-678-9623 or 606-561-4983 Chain Case Counter shaft: removed Drive the input shaft bearing out of the flanged hole in Detent shaft: removed the chain case housing. See Figure 5.56. Shift fork: removed Figure 5.56 Drift The input shaft can be driven out of the bearing that supports it.
  • Page 52 For Parts Call 606-678-9623 or 606-561-4983 450 Series Tillers Input shaft The Input shaft is carried by two bearings. See Figure 5.59. • If one bearing is bad, both should be replaced. • The second bearing fits into the gear positioning bracket.

  • Page 53: Shift Arm

    For Parts Call 606-678-9623 or 606-561-4983 Chain Case Shift arm Main shaft Lift the top gear and washer off of the main shaft. See Figure 5.61. Figure 5.61 Double nut the main shaft, and loosen but do not remove the nut on the bottom of the shaft using an 11/16”...
  • Page 54 For Parts Call 606-678-9623 or 606-561-4983 450 Series Tillers Lift the top gear and washer off of the counter shaft. See Figure 5.64. Counter shaft Figure 5.64 Tine gear Lift the paired wheel and tine gears, along with the washer that fits between them off of the main shaft.
  • Page 55 For Parts Call 606-678-9623 or 606-561-4983 Chain Case Lift the input spur gear, along with the shift fork, spacer and detent shaft out of the chain case hous- ing. See Figure 5.67. Detent shaft Input spur gear Shift fork Figure 5.67 Counter shaft Double nut the counter shaft and remove the nut, lock washer and Belleville washer from the bottom of...
  • Page 56 For Parts Call 606-678-9623 or 606-561-4983 450 Series Tillers Remove the input shaft, as described in the Input Shaft section of this chapter. See Figure 5.70. Figure 5.70 Remove the snap ring from the shift arm. Push the shift arm into the interior of the chain case for final removal.

  • Page 57: Inspection

    For Parts Call 606-678-9623 or 606-561-4983 Chain Case Inspection The inspection of chain case parts is just a visual check, with some fit checking by feel. Precision measurement is not required. When damage is identified, the repair is not complete until the root cause of the damage is found and fixed, so that the damage will not happen again.
  • Page 58 For Parts Call 606-678-9623 or 606-561-4983 450 Series Tillers Shift mechanism: Replace shift mechanism components if: • Replace the shift arm if the pin that engages the shift fork is worn. • Replace the shift arm if the shaft is worn to the point that the pin can come out of the shift fork. Take a close look at the chain case housing if this is the case.

  • Page 59: Final Assembly Notes

    For Parts Call 606-678-9623 or 606-561-4983 Chain Case Final Assembly Notes Clean the sealant residue and any grease from the mating surfaces of the chain case halves. See Figure 5.72. Fill the case with 40 oz. (1.2 liters) of Benalene grease (part number 737-0300A).
  • Page 60 For Parts Call 606-678-9623 or 606-561-4983 450 Series Tillers Temporarily install the input pulley onto the input shaft, installing the bolt that holds it just far enough that the pulley will not fall off. Use an allen wrench to move the shift arm through each of the tiller mode positions, while turning the input pul- ley.
  • Page 61 For Parts Call 606-678-9623 or 606-561-4983 Chain Case Troubleshooting Chart Symptom Cause Cure No drive to tines or No drive to input shaft Check belt, belt tensioning, wheels in any mode and pulleys. External repair. Shift fork stuck in Neu- tral Repair shift fork/shift arm.
  • Page 62 For Parts Call 606-678-9623 or 606-561-4983 450 Series Tillers Troubleshooting Chart Symptom Cause Cure Tines drive, but wheels Damage to gear drive to Repair input spur gear and/or do not turn in Reverse till wheels paired wheel drive gear on main mode shaft.
  • Page 63 For Parts Call 606-678-9623 or 606-561-4983 Chain Case Troubleshooting Chart Symptom Cause Cure Gears difficult to engage Operating technique Coach operator on feather- ing the engagement bail. Wheels reverse only difficult to engage-bot- Flip-over the top gear on the tom gear on counter counter shaft so the beveled shaft installed back- side of the teeth face down.
  • Page 64 For Parts Call 606-678-9623 or 606-561-4983 450 Series Tillers Troubleshooting Chart Symptom Cause Cure Chain case binds in any 1 - 3. The wheel axle is Install the wheel axle so that drive mode that powers binding in the case.
  • Page 65 For Parts Call 606-678-9623 or 606-561-4983 Chain Case Troubleshooting Chart Symptom Cause Cure Tiller jumps out of gear Tines Reverse only, Install Service Kit # 753- 2010 models, fix as fail 06491 Bent shift rod Confirm that the external link- age is moving the shift Worn detent pointer to the correct position,...
  • Page 66 For Parts Call 606-678-9623 or 606-561-4983 450 Series Tillers www.mymowerparts.com...

  • Page 67: Chapter 6: Tines

    Tines CHAPTER 6: TINES Tines Tine assembly 450 series tillers feature the ability to operate the tines in either forward or counter rotating directions. See Figure 6.1. As the tines dig into the ground, the grinding action between the tines and the soil will eventually wear the tines to the point were they will need to be replaced.
  • Page 68 For Parts Call 606-678-9623 or 606-561-4983 450 Series Tillers Lift the trail shield to easily access the clevis pin and bow-tie clip Clevis Pin Remove the clevis pin and bow tie clip that secures the tine assemblies to the tine shaft on the transmis- sion.
  • Page 69 For Parts Call 606-678-9623 or 606-561-4983 Tines Tine Holder Assemble the tines by following the previous steps in reverse order. NOTE: When attaching the tines to the tine holder; the tines are installed in an alternating manner point- ing the curved part of the tine in then out. NOTE: The tines are all installed on same side of the tine holder.
  • Page 70 For Parts Call 606-678-9623 or 606-561-4983 450 Series Tillers www.mymowerparts.com...

Table of Contents

Save PDF