Cub Cadet RT 75 User Manual
Professional Shop ManualProfessional 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 outd oor 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 inexperienced 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 Operators 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 accura te as possible at the time of publication. However, du e 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 2013 MTD Products Inc. All Rights Reserved
Table of Contents
Chapter 1: Introduction
About the text format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Fasteners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Assembly instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Understanding model and serial numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
The RT 75 Series Tiller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Maintenance Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Chapter 2: Belts
Belt Removal/replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Chapter 3: Cables
Forward Drive Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Reverse Drive Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Chapter 4: Engine
Engine Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Chapter 5: Transmission Removal
Transmission removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Chapter 6: Transmission Overhaul
Transmission Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Transmission Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Chapter 7: Tines
Tines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Chapter 8: Swivel Handle
Handle bar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Swivel Bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
I
II
Introduction
! WARNING! WARNING
! DANGER! DANGER
! CAUTION! CAUTION
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 co rrect at the time of writing. Both the product and the infor-
mation about the product are subject to change without notice.
About the text format
Certain flags and key words are used to indicate the nature of the text that accompanies them. They are as follows:
CAUTION: Indicates a potentially hazardous situation that, if not avoided, may result
in minor or moderate injury. It may also be used to alert against unsafe practices.
WARNING: Indicates a potentially hazardous situation that, if not avoided, could
result in death of serious injury.
DANGER: Indicates an imminently hazardous situation that, if not avoided, will result
in death or serious injury. This signal word is to be limited to the most extreme situa
tions.
NOTE: “NOTE” is used to point-out helpful information that may not fit as a step in a procedure.
1. Numbered steps indicate specific things that should be done, and the order in which they should be done .
1a. Sub steps will be lettered and nested within steps. Two or more sub steps may be combined to describe
the actions required to complete a step.
• Bullet points: Indicate sub-steps or points of interest, without implying order or relative importance.
Disclaimer: This manual is intended for use by trained, professional technicians.
• Common sense in operation and safety is assumed.
-
If the person using this manual is uncomfortable with any procedures they encounter, they should seek the help
of a qualified technician.
• In no event shall MTD be liable for poor text interpretation, or poor execution of the procedures described
in the text.
1
RT 75
• Be prepared in case of emergency:
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.
• Replace any missing or damaged safety labels on equipment being serviced.
• Remember that some hazards have a cumulative effect. A single exposure may
cause little or no harm, but continual or repeated exposure may cause very ser ious
harm.
• Clean spills and fix obviously dangerous conditions as soon as they are noticed.
• Lift and support heavy objects sa fely and securely.
• Be aware of your surroundings and potential h azards that are inhe rent to all power
equipment. All the labels in the world cannot protect a technician from an in stant of
carelessness.
! CAUTION! CAUTION
• Grooming and attire:
Do not wear loose fitting clothing that may become entangled in equipment.
Long hair should be secured to prevent entanglement in equipment.
Jewelry is best removed.
• Protective gear: includes, but is not limited to
Clear eye protection ................................ while working around any machinery
Protective gloves ..................................... where necessary
Armored footwear.................................... when working around any machinery
Hearing protection ................................... in noisy environments
Chemically resistant gloves..................... when working with chemicals or solvents
Respirator................................................ when working with chemical or solvents
Appropriate tinted eye protection............. when cutting or welding
Flame resistant headgear, jacket, chaps. when cutting or welding
! WARNING! WARNING
• Exhaust fumes from running engines contain carbon monoxide (CO). Carbon
monoxide is a colorless odorless gas that is fatal if inhaled in sufficient quantity.
Only run engines in well ventilated areas. If running engines indoors, use an
exhaust evacuation system with adequate make-up air ventilated into the shop.
! DANGER! DANGER
2
Introduction
Fasteners
• The fasteners used on the equipment described in this manual, and the engine that powers it are a co mbination of metric and fractional inch. For this reason, wrench sizes are frequently identified in the text, and
measurements are given in U.S. and metric scales.
• If a fastener has a locking feature that has worn, replace the fastener or apply a small amount of releasable thread locking compound such as Loctite® 242 (blue).
• Some fasteners, like cotter pins, are single-use items that are not to be reused. Other fasteners, such as:
lock washers, retaining rings, and internal cotter pins (hairpin clips), may be reused if they do not show
signs of wear or damage. This manual leaves that decision to the judgement of the technician.
Assembly instructions
• Torque specifications may be noted in the part of the text that covers assembly. They may be summarized in tables along with special instructions regarding locking or lubrication. Whichever method is more
appropriate will be used. In many cases, both will be used so that the manual is handy as a quick-reference guide as well as a step-by-step procedure guide that does not require the user to hunt for information.
• Lubricant quantity and specification may be noted in the part of the text that covers maintenance, and
again in the section that covers assembly. They may also be summarized in tables along with special
instructions. Whichever method is more appropriate will be used. In many cases, the information will be
found in several places in the manual so that the manual is handy as a quick-r eference g uide as we ll as a
step-by-step procedure guide that does not require the user to hunt for information.
• The level of assembly instructions provided will be determined by the complexity of reassembly, and by
the potential for damage or unsafe conditions to arise from mistakes made in assembly.
• Some instructions may refer to other parts of the manual for subsidiary procedures. This avoids repeating
the same procedure two or three times in the manual.
3
RT 75
Figure 1.1
The RT 75 series tiller
The RT 75 tiller is a new tiller line that was introduced
for the 2014 model year . This is a r ear tine, coun ter rot ating
tiller that features:
• Ball bearings on the wheel and tine shafts
• Bronze worm gears.
• A neutral lever to disengage the transmission.
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
• 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . indicates that this is a tiller
means is as follows:
• . . A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . indicates the sales revision
• . . . . C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . indicates the tire size
• . . . . . . 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . indicates this is a 400 series tiller
• . . . . . . . 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . indicates th e a swin g ha ndle (48 0 tra n sm issio n)
• . . . . . . . . . 2R. . . . . . . . . . . . . . . . . . . . . . . . . indicates the engine
• . . . . . . . . . . . . .710 . . . . . . . . . . . . . . . . . . . . . indicates the customer
The serial number is 1J053P10005. The serial number
• 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . engineering level
• . J. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .month of production (J = October)
• . . .05 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .day of the month
• . . . . . 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .last digit of the year
• . . . . . . .P. . . . . . . . . . . . . . . . . . . . . . . . . . . . .plant it was built in
• . . . . . . . . . 1 . . . . . . . . . . . . . . . . . . . . . . . . . .assembly line number
• . . . . . . . . . . 0005 . . . . . . . . . . . . . . . . . . . . . .number of unit built
Additional technical and service information may also be available to our company authorized service center personnel through our company corporate offices, regional parts distributors and regional service center field support
personnel. Please contact the designated support office in your area or our corporate offices directly should further
service information be needed.
reads as follows:
MTD Products LLC
P.O. Box 368022
Cleveland, OH 44136
Telephone: (800) 800-7310
www.mtdproducts.com
4
Maintenance chart
Maintenance item Each use Each 25 hrs. use Each 50 hrs. use
Introduction
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: Change oil after first 5 hrs of use and before prolonged storage
Change air filter
Note on air filter Air filter and pre-filter life vary dramatically with operating conditions
Drain or preserve fuel Before prolonged storage
Fog or lube cylinder Before prolonged storage
*
*
*
*
*
*
*
*
Rotate engine to TDC Before prolonged storage
Remove wheels and lube wheel shaft Once a year
Remove tines and lube tine shaft Once a year
Engine RPM 3500 +
100
5
RT 75
6
Figure 2.1
screws
Figure 2.2
reverse idler
pulley
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:
1. Disconnect and gr ound the spark plug wire.
2. Remove the two screws that secure the belt cover.
See Figure 2.1.
Belts
3. Swing the belt cover up and off of the tiller.
4. Slide the forward drive belt off of the engine pulley.
5. Loosen the nut and bolt that secure the reverse idler
pulley to the idler bracket using a pair of 7/16”
wrenches.
6. Slide the reverse belt past the belt guards and off of
the idler pulley.
See Figure 2.2.
7
RT 75
Figure 2.3
screws
Figure 2.4
reverse idler spring
belts pushed down
Figure 2.5
fender washer
shoulder
lock washer
spacer
Z-fitting
remove this
screw
7. Remove the four screws that secure the transmission 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.
8. Push both belts down onto the transmission pulley.
See Figure 2.4.
9. Unhook the reverse idler spring. See Figure 2.4.
10. Unhook the rever se cable Z-fitting from the reverse
idler bracket.
11. Remove the reverse idler bracket using a 1/2”
wrench.
See Figure 2.5.
8
Belts
Figure 2.6
7/8” nut
Figure 2.7
forward drive belt
reverse belt
hub
12. Remove the nut that secures the transmission pulley
using a 7/8” socket and an impact wrench.
See Figure 2.6.
13. Slide the transmission pulley and both belts off
together.
14. Position the new belts on the transmission pulley.
See Figure 2.7.
15. Install the belts by following steps 1 through 13 in
reverse order.
NOTE: The transmission pulley has a star shaped center
hole. When installing the pulley, the star must fit
over the raised star on the hub.
16. Test run the tiller in a safe area before returning it to
service.
See Figure 2.7.
9
RT 75
Belt Routing
Forward drive belt
Reverse drive belt
Transmission pulley
Engine
Pulley
10
Figure 3.1
reverse lever
forward drive bail
Figure 3.2
Reverse lever hitting
the drive bail
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.
Cables
The shape of the drive bail and reverse lever will help prevent the operator from engaging the reverse lever while
in the forward mode. As the reverse lever is engaged, the bend on the bottom of it hits the drive bail making it ne ces
sary to release the drive bail. See Figure 3.2.
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11
RT 75
Figure 3.3
Disconnect the
cable fitting
Figure 3.4
Ford fuel
line tool
Figure 3.5
Remove these
screws
washer
Forward drive cable
To remove/replace the forward drive cable:
1. Disconnect and ground the spark plug wire.
2. Disconnect the black cable fitting from the handle bar
bracket.
NOTE: A ford fuel line tool is useful to compress the
See Figure 3.3.
ears on the cable fitting while removing it.
See Figure 3.4.
3. Unhook the Z-fitting from the forward drive bail.
4. Remove the two screws that secure the belt cover.
See Figure 3.5.
5. Swing the belt cover up and off of the tiller.
12
Cables
Figure 3.6
Loosen this screw
Disconnect
this cable
Figure 3.7
Disconnect cable
6. Loosen, but do not remove, the screw securing the
cable pulley.
7. Slip the cable off of the pulley.
8. Disconnect the black cable fitting from the cable
bracket.
9. Unhook the spring end of the cable from the forward
idler bracket.
See Figure 3.6.
See Figure 3.6.
See Figure 3.7.
NOTE: The spring end of the cable is to help prevent over
tensioning of the drive belt.
10. Install the cable by following the previous steps in
reverse order.
11. Test run the tiller in a safe area before returning it to
service.
13
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