1. Manuals
  2. Brands
  3. MTD Manuals
  4. Lawn Mower
  5. C series
  6. Shop manual

MTD C series Shop Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
Professional Shop Manual
"C" and "D" Series Mowers
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 - 769-07008
06/2011

Advertisement

Table of Contents
loading

Related Manuals for MTD C series

Summary of Contents for MTD C 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 3: Table Of Contents

    Table of Contents Chapter 1: Introduction About the text format ..................1 Safety ......................... 2 Fasteners ......................3 Assembly Instructions ..................3 The “C” Series Mower ..................4 The “D” Series Mower ..................4 Understanding Model and Serial Numbers ............5 Maintenance chart ....................6 Fastener Tightening Torques ................6 Chapter 2: Blade and Belt Blades ........................

  • 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...

  • Page 6: Safety

    C and D series mowers 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

    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: The "C" Series Mower

    C and D series mowers The “C” Series Mower The “C” series mower is a 21” (53cm) platform intro- duced for the 2011 season. “C” series refers to the 5th character in the model number. See Figure 1.1. • Rear wheel drive with variable speed transmis- sion.

  • Page 9: Understanding Model And Serial Numbers

    Please contact the Central Service Distributor in your area or our contact our corporate offices directly for further service information. MTD Products LLC P.O. Box 368022 Cleveland, OH 44136 Telephone: (800) 800-7310 www.mtdproducts.com...

  • Page 10: Maintenance Chart

    C and D series mowers Maintenance chart Maintenance item Each use Each 25 hrs. use Each 50 hrs. use Check engine oil Check air filter Check for loose/bent blade Check & gap spark plug Replace if worn Check cooling fins After prolonged storage Check/clean spark arrestor Change oil...

  • Page 11: Chapter 2: Blade And Belt

    Blade and Belt CHAPTER 2: BLADE AND BELT Blades The condition of the blades will greatly effect the quality of the cut. The blades should be sharpened and balanced after every 10 hours of cutting, or when a change in cut quality or performance is noticable.

  • Page 12: Blade Removal

    Block the blade from rotating using a block of wood or a blade holder tool. Blade holding tool Blade bolt NOTE: MTD blade holding tool, part number 490- 850-0005, can be used block the blade. See Figure 2.2. Remove the blade bolt and diamond-shaped Belleville blade spring using a 5/8”...
  • Page 13 The lips on the center span of the blade should curve down, away from the blade adaptor NOTE: Aftermarket blades in non MTD brands or Arnold brand may not have the correct shape drive fea- ture, and may not meet safety requirements for thrown objects.

  • Page 14: Blade Sharpening

    A poorly balanced blade will cause ! CAUTION ! CAUTION excessive vibration and may cause damage to the mower and result in personal injury. NOTE: MTD blade balancer AR-SBB-102 or the blade balancing kit, AR-BSK-1 can be used to balance the blade. Figure 2.6...

  • Page 15: Belt Removal 1

    The belts used on the C & D series mowers come from various belt manufacturers, but are made to MTD specifications. These specifications are tailored to the mower design, and seldom work-out to standard belt lengths. If MTD went to the trouble and expense of designing a belt for the application, there is a rea- son they did so.
  • Page 16 C and D series mowers Belt Slide the blade adaptor / drive pulley off of the crankshaft. The belt will come off with it. See Figure 2.8. Blade adaptor Figure 2.8 At the back of the mower, lift the rear grass door to reveal the upper belt cover.
  • Page 17 Blade and Belt NOTE: It is not strictly necessary to disconnect the cables, Bracket but doing so will make alignment and installation of the belt keeper / bracket easier during reassembly. 12. Squeeze the barb on the bottom end of the drive Barb clutch cable to release it from its bracket.

  • Page 18: Belt Replacement

    C and D series mowers Work the belt off of the transmission pulley and remove it from the mower. See Figure 2.14. Check the belt, pulleys, and cables for any problems that might cause premature belt failure: • Work the drive clutch control and check the cable for full travel and smooth operation.
  • Page 19 Blade and Belt Position and attach the belt keeper / bracket to the Left leg transmission. See Figure 2.17. • The left leg of the bracket locates over a post on the transmission housing. • The right leg of the bracket is secured with two screws that go into the plastic transmission housing.
  • Page 20 C and D series mowers Install the blade, and tighten the blade bolt to a torque of 450-600 in.-lb. (50-70 N-m) Check the operation of the new belt: See Figure 2.21. 9a. With the spark plug still disconnected, support the rear of the mower so that the wheels are off the ground, while the front wheels rest on the ground.

  • Page 21: Chapter 3: Controls And Cables

    19,000 ft./minute (5,790 meters/ minute) without going over. See Figure 3.1. NOTE: For 21” (53.3cm.) mowers, that limit is 3,458 RPM. Staying safely below that limit, MTD specs the engines on the C and D series mowers to run at 3,200 +100 RPM.
  • Page 22 C and D series mowers To Remove / Replace the Engine Control Cable: Make sure the engine is off and cool enough to safely work around. Z-fitting Squeeze the side of the bail that the cable attaches to inward. When the end of the bail clears the hole in the han- dlebar that it pivots in, move the bail away from the hole and release the pressure.

  • Page 23: Drive Control Housing Assembly

    Blade and Belt Use the slack created in the cable to release the Z-fit- ting from the engine stop control on the engine. See Figure 3.6. Use a pair of needle nose pliers to squeeze the barb Z-Fitting at the engine end of the cable housing, releasing it from the the bracket on the engine.

  • Page 24: Drive Control Housing Removal And Disassembly

    C and D series mowers Clutch engagement: Control housing, upside down • Within the housing, the two levers cross one Secondary lever another. See Figure 3.8. Left-hand side clutch • A secondary lever pivots on the same fulcrum as the right-hand side control lever. control lever •...
  • Page 25 Blade and Belt Screws The control housing is held together and fastened to the upper handlebar by four screws. Remove all four screws using a 3/8” wrench. The shoulder screws go through the handlebar. See Figure 3.11. Carefully separate the two halves of the control hous- ing just enough to allow the housing to be removed from the handlebar.
  • Page 26 C and D series mowers Tall post UP 2 Lift the right-hand side “UP2” control lever off of the tall fulcrum post and out of the control housing. See Figure 3.14. Figure 3.14 Lift the right-hand side “UP1” control lever off of the Short post short fulcrum post and out of the control housing.
  • Page 27 Blade and Belt Speed 13. Lift the flanged end of the speed control cable out of control its pocket in the control housing. See Figure 3.17. actuator 14. Pivot the cable to align with the slot in the speed con- trol actuator,and separate the cable-end barrel from the actuator.
  • Page 28 C and D series mowers Reasembly notes: The pinion gear on the speed control lever must be Clutch cable centered in the rack that moves the clutch cable bracket bracket. See Figure 3.20. Rack teeth • As the speed control lever pivots the actuator in one direction, the clutch cable bracket moves in the opposite direction.

  • Page 29: Drive Clutch Control Cable Removal And Replacement

    Blade and Belt Drive Clutch Control Cable Removal and Replacement: Disconnect the top (adjustable) end of the clutch con- trol cable. Use the instructions in the Drive Control Housing section of this chapter. With the grass collector bag removed, lift the grass door at the back of the mower, and secure it with a prop or a strap.

  • Page 30: Drive Speed Control Cable Removal And Replacement

    C and D series mowers Drive Speed Control Cable Removal and Replacement: Disconnect the top (adjustable) end of the clutch control cable. Use the instructions in the Drive Con- trol Housing section of this chapter. With the grass collector bag removed, lift the grass door at the back of the mower, and secure it with a prop or a strap.

  • Page 31: Chapter 4: Deck And Transmission

    Deck and Transmission CHAPTER 4: DECK AND TRANSMISSION Trail Shield Never operate a mower without the trail shield. It is a safety device that is required by law. ! CAUTION ! CAUTION The trail shield is designed to drag on the ground behind the mower. This helps keep the oper- ator from getting their feet under the mowing deck.

  • Page 32: Side Discharge Door / Mulch Plug

    C and D series mowers Side Discharge Door / Mulch Plug Never operate a mower without the side discharge door properly in-place. It is a safety device ! CAUTION ! CAUTION that is required by law. The side discharge door is designed to contain grass clippings and light yard debris. In mulch- ing mode, it keeps clippings under the deck.
  • Page 33 Deck and Transmission NOTE: The side discharge door will typically be serviced as an assembly, and there is little need to sepa- rate the parts of the assembly in the field. Disas- sembly is not reccomended, but if it is necessary Withdraw pin for any reason, the following procedure can be used.

  • Page 34: Deckwash Fitting

    Deckwash Fitting The C and D Sereis mowers are available with deck- wash fittings. These fittings resemble fittings that MTD has used on previous equipment, but the mounting is different. Removing the quick-connect hose coupling reveals the new plastic fitting. See Figure 4.9.

  • Page 35: Rear Grass Door

    Deck and Transmission Rear Grass Door Never operate a mower without the rear grass door properly in-place. It is a safety device that ! CAUTION ! CAUTION is required by law. The rear grass door is designed to contain grass clippings and light yard debris. In mulching mode, it keeps clippings under the deck.
  • Page 36 C and D series mowers Outer tail NOTE: The grass door torsion springs are mirror image of each other. There is a left spring and a right spring. • The inner tail of each spring hooks through the L-shaped hole in the grass door. See Figure 4.13.

  • Page 37: Front Wheels

    Deck and Transmission 10. Push a 5/32” x 1-1/2” (4mm x 40mm) cotter pin through the gap, coming up from the bottom. Bend both ends of the cotter pin down around the hinge loop. See Figure 4.16. 11. Confirm that the grass door pivots freely, fits properly against the grass bag, and closes fully.
  • Page 38 • The wheel and pinion gear should be replaced as a pair. • The bearings used in the 11” rear wheels are not available separately from MTD. Replace the wheel if the bearings have failed. Pinion gear Figure 4.21...
  • Page 39 Deck and Transmission 12. The pinion gear slides off of the transmission drive shaft. See Figure 4.22. NOTE: Apply a small amount of anti-seize compound to the splines when installing the pinon gear, but do not use a grease lubricant on the teeth of the gears.

  • Page 40: Front Axle

    C and D series mowers Front Axle To remove and replace the axle: C-series mower with under-shot height Remove the wheels by following the procedure adjuster link. described in the previous section of this chapter. Set the height adjuster to the highest mowing posi- tion.
  • Page 41 Deck and Transmission Ease the front axle back into a postition that com- pletely relaxes the lift assist spring. Remove the front axle retainers using a 3/8” wrench. See Figure 4.26. Retainer Front axle Figure 4.26 With the retainers off, the axle will still be held in place by two spring tabs on each end of the axle.
  • Page 42 C and D series mowers The spring is captive on the front axle weldment. See Figure 4.29. Figure 4.29 To install the front axle, position the tail fo the spring into the locator slot. • The hook end of the spring should be between the elbow in the front axle weldment and the plastic front axle cover.

  • Page 43: Front Axle Cover

    Deck and Transmission 15. Reconnect the height adjuster link. Tighten the screw to a torque of 45-50 in-lbs. (4-5 Nm). See Figure 4.32. 16. Reinstall the wheels. NOTE: Apply a small amount of a dry lubricant such as graphite or PTFE (Tefflon®) to the axle shaft before sliding the wheel on.

  • Page 44: Handlebars

    C and D series mowers Handlebars NOTE: Most service procedures that would involve removal of the handlebars will also involve removal of the rear baffle. We have written the procedures around this assumption, dis- connecting the handlebars and removing them completely from the mower. Disconnect and ground the spark plug wire to pre- vent accidental starting of the mower.

  • Page 45: Transmission And Rear Axle Inspection

    • The belt should not be significantly worn or damaged. Spin-test • Confirm that the correct MTD part number belt is on the mower. • Check the operation of the clutch cable and the engagement of the belt, as described in chapter 3.

  • Page 46: Transmission And Rear Axle Removal

    C and D series mowers Transmission and Rear Axle Removal The transmission and rear axle assembly are removed Rear wheel, dust cover from the mower together: and pinion gear removed After checking the transmission, the mower will be in the following condition: •...
  • Page 47 Deck and Transmission Remove the shoulder screw that connects the height control link to the left rear wheel bracket using a 3/8” wrench. See Figure 4.41. Pivot the height control link forward, out of the way, or remove it completely. Height adjuster control link Figure 4.41...
  • Page 48 C and D series mowers Pocket Spherical bearing Slip the spherical bearings out of the pockets that locate them in the rear baffle, and remove the trans- mission and axle assembly together. See Figure 4.44. Figure 4.44 Transmission and With the transmission and axle assembly removed, rear axle assembly the transmission can be separated from the axle: See Figure 4.45.

  • Page 49: Transmission And Variable Speed Pulley

    Deck and Transmission Spherical bearing 14. Examine the spherical bearings. If they show signs of significant wear, replace them with new ones. See Figure 4.47. • It is false economy to save a few dollars on the bear- ings only to disassemble the mower a few months later to replace the bearings.
  • Page 50 NOTE: Speed control cam and transmission input pulley parts are not available through MTD. The procedures illustrated here may be use- ful if the assembly is taken apart for cleaning or lubrication.
  • Page 51 Deck and Transmission Once the nut is removed, the top sheave will slide off of the double-D shaped shaft. See Figure 4.52. The lower sheave mates to the upper pulley with splines. Upper sheave: drives input shaft with double-D drives lower sheave with spline Figure 4.52 Speed control cam...
  • Page 52 C and D series mowers The speed control cam and bearing assembly will lift off of the input shaft. See Figure 4.55. Figure 4.55 On reassembly, orient the speed control cam and bearing so that the small ear on the cam is just past the blue oil fill plug with the cam in the relaxed posi- tion (sheaves spread).

  • Page 53: Rear Baffle Removal

    Deck and Transmission Rear baffle removal NOTE: The rear baffle comes complete with the rear grass door. Screws Allow the engine to cool, then disconnect and ground the spark plug wire. Confirm the the fuel level is low enogh that there is no risk of spillage.
  • Page 54 C and D series mowers Remove the 6 screws that hold the rear baffle to the mower deck using a T-40 driver or a 9/16” wrench. See Figure 4.60. Wear protective gloves and use cau- ! CAUTION ! CAUTION tion when working near the blade. Rear baffle Rear baffle mounting screws Figure 4.60...
  • Page 55 Deck and Transmission 11. The two locating tabs on each side of the rear baffle must be seated in the slots behind the rear baffle mounting screws before teh screws are tightened. See Figure 4.63. 12. The lip on the rear edge of the lower belt cover needs to fit into the opening in the rear baffle.

  • Page 56: Transmission Internal Workings

    C and D series mowers Transmission Internal Workings NOTE: There are no internal parts for this transmission available through MTD. If the transmission in a C or D series mower fails, replace it as a complete assembly. This section explains the internal opera- tion of the transmission so that technicians have a better understanding of how it works.
  • Page 57 Deck and Transmission Blue thrust washers The helical gear assembly drives the axles through a Axle splined connection. See Figure 4.66. There is one blue thrust washer separating the bear- ing and seal assembly from a cirlip on the axle. There is a second blue thrust washer between the Snap ring circlip and the outside of the pinion assembly.
  • Page 58 C and D series mowers When assembled correctly, the sweep of the single cam slot should match the sweep of the lobes on the rotor, guiding the pawl to seat in the hook at the trail- ing edge of each lobe in the rotor. See Figure 4.69. Figure 4.69 The A-side drag plate contains four cam slots.

This manual is also suitable for:

D series

Table of Contents