Cub Cadet Medium Frame 3 Stage User Manual
Professional Shop Manual
Medium Frame 2 & 3 Stage Snow Throwers
(500, 600 and 700 series)
2005 to present
NOTE: These materials are for use by trained technician s who are experi enced in the service and repair of outdoor power
equipment of the kind described in this publication, and are not inte nded for use by untrained or inexperienced ind ividuals.
These materials are intended to provide supplemental information to assist the trained technician. Untrained or inexperienced individuals should seek the assistance of an experie nced and trained prof essional. Read, understand, a nd follow all
instructions and use common sense when working on powe r e quip ment. T his 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 comple te and accu rate as possible at the time of publ ication. 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 2013 MTD Products Inc. All Rights Reserved
MTD Products Inc. - Product Training and Education Department
Table of Contents
Chapter 1: Introduction
Professional Service Manual Intent .......................................................................1
Safety ....................................................................................................................1
Fasteners .............................................................................................................. 3
Assembly Instructions ........................................................................................... 3
Identifying Snow Thrower Series........................................................................... 3
Understanding Model And Serial Numbers ...........................................................4
Chapter 2: Belts And Cables
Auger Belt .............................................................................................................7
Drive Belt .............................................................................................................10
Auger Control Cable ...........................................................................................11
Drive Clutch Control Cable ..................................................................................13
Auger and Drive Cable Adjustments (500, 600 and 3-wheel Track Drives) ........14
Auger Cable Adjustments (2-wheel Track Drives) ..............................................15
Speed Selector Cable .........................................................................................16
Speed Selector Rod ............................................................................................18
Auger and Drive Lever Interlock.......................................................................... 20
Chapter 3: 500 Series Drive System
Axle Assemblies ..................................................................................................23
Hex Drive Shaft ...................................................................................................26
Planetary Gears...................................................................................................27
Friction Wheel Replacement............................................................................... 29
Chapter 4: 600 Series Drive System
Axle Assemblies ..................................................................................................31
Hex Drive Shaft Assembly ...................................................................................33
Friction Wheel Replacement............................................................................... 35
Chapter 5: 700 Series 2-Wheel Track-Drive System
Track Adjustment ................................................................................................37
Track and Track Wheels ..................................................................................... 38
Hex Drive Shaft ...................................................................................................39
Friction Wheel Replacement............................................................................... 43
Axle Shaft ............................................................................................................44
Planetary Gears and Shaft ..................................................................................46
Steering Trigger Cables ...................................................................................... 51
I
Chapter 6: 700 Series 3-Wheel Track-Drive System
Track Removal/replacement ............................................................................... 53
Track Drive Assembly ......................................................................................... 58
Drive Axle Assemblies .........................................................................................59
Hex Drive Shaft and Planetary Gears................................................................. 60
Friction Wheel Replacement ...............................................................................63
Idler Hold Down Tools .........................................................................................64
Chapter 7: Auger Housing and Gear Box
Skid Shoes.......................................................................................................... 67
Skid Shoe Adjustment......................................................................................... 67
Shave Plate .........................................................................................................68
Auger Housings ...................................................................................................69
Auger Assemblies ............................................................................................... 71
2-Stage Gear Boxes ............................................................................................74
3-Stage Gear Boxes ............................................................................................78
Chapter 8: Discharge Chute and Controls (Manual Crank)
Remote Pitch Control Head (Plastic Chutes) ......................................................83
Remote Pitch Control Head (Steel Chutes)......................................................... 86
Discharge Chute (Manual Crank, Cork Screw Style).......................................... 89
Discharge Chute (with Remote Head)................................................................. 90
Manual Crank, Cork Screw Style ........................................................................ 92
Chute Bracket Adjustment ..................................................................................92
Remote Head ......................................................................................................93
Chapter 9: Discharge Chute and Controls (Joystick, Cable Style)
Remote Pitch Control Head (Plastic Chutes)...................................................... 97
Discharge Chute (with Remote Head) ...............................................................100
Joystick (Cable Style) ........................................................................................102
Chapter 10: Discharge Chute and Controls (Joystick, Hex Shaft)
Remote Pitch Control Head (Plastic Chutes).................................................... 105
Remote Head (Joystick, Hex Shaft) ..................................................................108
Joystick (Hex Shaft) ..........................................................................................114
Chapter 11: Discharge Chute and Controls (Electric)
Remote Pitch Control Head (Plastic Chutes) ....................................................119
Remote Pitch Control Head (Steel Chutes) .......................................................122
Discharge Chute ...............................................................................................125
Electric Chute Control .......................................................................................130
Electric Joystick and Harness ........................................................................... 131
Electric Joystick Bracket ....................................................................................132
Chute Control Assembly ....................................................................................136
Chute Control Motors
........................................................................................137
Electric Chute Control Pitch Cables ..................................................................140
Schematics ........................................................................................................143
II
Introduction
Caution is used to point out potential danger to the technician, operator, bystanders, or surrounding property.
! CAUTION! CAUTION
Warning indicates a potentially hazardous situation that, if not avoided, could result in death
or serious injury.
! WARNING! WARNING
! DANGER! DANGER
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 situations
CHAPTER 1: INTRODUCTION
Professional Service Manual Intent
This Manual is intended to provide service dealers with an introduction to the mechanical aspects of medium
frame two and three stage snow throwers.
NOTE: Please refer to the engine’s service manual for all maintenance and repair procedures.
Disclaimer: The information contained in this manual is correct at the time of writin g. Both the prod u ct an d th e inf or -
mation about the product are subject to change without notice.
About the text format:
NOTE: is used to point out information that is relevant to the procedure, but does not fit as a step in the proce-
dure.
• Bullet points: indicate sub-steps or points.
1. Numbered steps
1a. Substeps
the actions required to complete a step.
Disclaimer: This manual is intended for use by trained, professional technicians.
• Common sense in operation and safety is assumed.
• In no event shall MTD or Cub Cadet be liable for poor text interpretation or poor execution of the proce-
dures 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 or Cub Cadet Technical Support.
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. Operator’s manuals may be viewed for free at the Cub Cadet website. It
will be necessary to have the complete model and serial number for the equipment.
indicate specific things that should be done, and the or der in which they should be done.
will be lettered and nested within steps. Two or more substeps may be combined to describe
1
Medium Frame 2 & 3 Stage Snow Throwers
• 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.
! 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
! CAUTION! CAUTION
• 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 serious
harm.
• Clean spills and fix obviously dangerous conditions as soon as they are noticed.
• Lift and support heavy objects safely and securely.
• Be aware of your surroundings and potential hazards that are inherent to all power
equipment. All the labels in the world cannot protect a technician from an instant of
carelessness.
2
Introduction
Figure 1.1
500 Series
Fasteners
• Most of the fasteners used on these snow throwers have SAE thread sizes.The engines have metric
thread sizes. 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 summa-
rized 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 manua l is hand y as a quick-reference guide a s well a s 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 pr ocedures. Th is avoid s repe ating
the same procedure two or three times in the manual.
Identifying Snow Thrower Series
NOTE: Medium frame two stage snow throwers are available as a 500, 600 or 700 series.
The 500 series features:
• Steerable drive wheels
• Auger housing width of 22” - 30”
• 2 stage and 3 stage augers available.
3
Medium Frame 2 & 3 Stage Snow Throwers
Figure 1.2
600 Series
Figure 1.3
700 Series
Figure 1.4
The 600 series features:
• Solid drive wheel axles
• Auger housing width of 22” - 30”
• 2 stage augers
The 700 series features:
• Track drive (2 and 3 wheel versions)
• Auger housing width of 24” - 30”
• 2 stage and 3 stage augers available.
Understanding Model And Serial Numbers
The model and serial numbers are located on a white
sticker with a bar code. The sticker is located at the back of
the machine, below and to the left of the speed selector
shaft.
4
Introduction
The model number is 31AH64FG795. The break down of what the model number
• 31 - - - - - - - - - - - - - - - - - - - - - - - - Indicates that this is a snow thrower.
• - - A- - - - - - - - - - - - - - - - - - - - - - - - Sales level
• - - - H- - - - - - - - - - - - - - - - - - - - - - - Starter (M = 110v electric starter with a 3A/5A split alternator)
• - - - - - 6 - - - - - - - - - - - - - - - - - - - - - Frame series
• - - - - - - 4 - - - - - - - - - - - - - - - - - - - - Engine (T = 277 cc Cub Cadet engine)
• - - - - - - - F- - - - - - - - - - - - - - - - - - - Handle panel style
• - - - - - - - - -G - - - - - - - - - - - - - - - - - Auger housing
• - - - - - - - - - - 795 - - - - - - - - - - - - - - Customer number
The serial number is 1H072B30186. The serial number
• 1 - - - - - - - - - - - - - - - - - -Engineering level
• - H - - - - - - - - - - - - - - - - -Month of production (H = August)
• - - - 07- - - - - - - - - - - - - - - -Day of the month
• - - - - - 2 - - - - - - - - - - - - - - -Last digit of the year
• - - - - - - B - - - - - - - - - - - - - -Plant it was built in
• - - - - - - - - 3 - - - - - - - - - - - - -Assembly line number
reads as follows:
means is as follows:
• - - - - - - - - - -0186 - - - - - - - - - -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.
Cub Cadet LLC
P.O. Box 368022
Cleveland, OH 44136
Telephone: (330) 273-8669
www.cubcadet.com
5
Medium Frame 2 & 3 Stage Snow Throwers
6
Auger Belt
Figure 2.1
3/8”
Hex Screws
Figure 2.2
Belts and Cables
Chapter 2: Belts And Cables
To remove/replace the Auger Belt:
NOTE: Prior to servicing or replacing any belts stop the
engine and allow it to cool. Then disconnect spark
plug and ground it to the engine
NOTE: If the unit is throwing the Auger Belt, inspect the
round part of the Auger Housing that the impeller
spins in. If there is a buckle or a crease in it, the
Auger Housing is bent and must be replaced
before replacing the belt.
1. Remove the two screws that secure the belt cover
using a 3/8” wrench. See Figure 2.1.
2. Lift the belt cover off of the unit.
NOTE: Some units have a belt guide. The belt guide can
be removed by removing the two screws, by the
arrows in Figure 2.2., using a 1/2” wrench.
7
Medium Frame 2 & 3 Stage Snow Throwers
Figure 2.3
Figure 2.4
3/8” wrench
Figure 2.5
Return Spring
3. Loosen the idler pulley enough for the belt to cl ear it
using a 1/2” wrench.
4. Slip the belt off of the engine pulley.
5. Drain the fuel into an approved container.
6. Carefully tip the snow thrower forward so it rests on
the auger housing.
7. Remove the bottom access panel. See Figure 2.4.
8. Remove the belt guide (the shoulder bolt) with a 3/
4” wrench and a 9/16” wrench. See Figure 2.5.
9. Unhook the idler bracket return spring.
8
Belts and Cables
Figure 2.6
Return
Spring
Figure 2.7
NOTE: On 2005 through 2007 model years, the Return
Spring hooked into a hole in the impeller housing.
See Figure 2.6.
NOTE: The idler bracket has a tab that acts as a brake,
pressing against the Auger Belt whenever the
Auger Control Lever is released.
10. Pull the belt down past the Auger Pulley. See Figure
2.7.
11. Install the belt by following the previous steps in
reverse order.
12. Start the engine.
13. Engage and disengage the Auger Control Lever a
few times.
14. With the Auger Control Lever disengaged, move to
the front of the unit and verify that the augers are not
moving.
NOTE: If the Augers are moving, adjust the cable tension
and repeat steps 12 through 14.
15. Test run the snow thrower in a safe area before
returning it to service.
9
Medium Frame 2 & 3 Stage Snow Throwers
Figure 2.8
Drive
Idler Bracket
Torsion
Spring
Figure 2.9
Drive Platter
Drive Belt
To remove/replace the drive belt:
NOTE: Prior to servicing or replacing any belt s, stop
the engine and allow it to cool. Then disconnect spark plug and ground it to the engine
1. Remove Auger Belt as described on the Auger Belt
section of this chapter.
2. Using a 3/8” wrench, rotate the Drive Idler Bracket
enough slip the belt off of the engine pulley. See
Figure 2.8.
3. Work the belt off the bottom of the Drive Platter.
4. Slip the belt between the Friction Wheel and Drive
5. Pull the belt up through the top of the housing.
6. Install the belt by following the previous steps in
7. Test run the snow thrower in a safe area before
Platter. See Figure 2.9.
reverse order.
returning it to service.
10
Auger Control Cable
Figure 2.10
Alignment mark
Figure 2.11
Figure 2.12
Belts and Cables
To remove/replace the Auger Control Cable:
NOTE: The auger control is on the left side of the handle
bars.
1. Place an alignment mark on the adjustment bracket
and the frame. See Figure 2.10.
2. Loosen the hex screws securing the adjustment
bracket to release tension off of the cable.
3. Detach the cable from the control handles. See Figure 2.11.
NOTE: On units with threaded Z-fittings:
• Loosen the jam nut.
• Unthread the cable from the Z-fitting.
4. Loosen the cable guide pulley on the adjustment
bracket and slip the cable out of the pulley groove.
5. Remove the belt cover.
6. Loosen the second cable guide pulley and slip the
cable out of the pulley groove. See Figure 2.12.
11
Medium Frame 2 & 3 Stage Snow Throwers
Figure 2.13
Idler Pulley Bracket
Auger Cable
7. Detach the spring end of the cable from the Idler
Pulley Bracket. See Figure 2.13.
8. Install the cable by following the previous steps in
reverse order.
NOTE: When attaching he spring end of the cable,
the open side of the spring faces the engine.
9. Test run the snow thrower in a safe area before
returning it to service.
12
Drive Clutch Control Cable
Figure 2.14
alignment mark
Figure 2.15
Drive platter support bracket
Belts and Cables
To remove/replace the Drive Control Cable:
NOTE: The drive control is on the right handle.
1. Stop the engine and allow it to cool. Disconnect the
spark plug wire and ground it to the engine.
2. Drain the fuel into an approved container.
3. Carefully tip the snow thrower forward so it rests on
the auger housing opening.
4. Place an alignment mark on the adjustment bracket
and
the frame. See Figure 2.14.
5. Detach the cable from the engagement handle.
NOTE: On units with threaded Z-fittings:
• Loosen the jam nut.
• Unthread the cable from the Z-fitting.
6. Remove the bottom access panel.
7. Unhook the spring end of the cable from the Drive
Platter Support Bracket. See Figure 2.15.
8. Unhook the cable from the pulley on the adjustment
bracket.
9. Install the cable by following the previous steps in
reverse order.
10. Test run the snow thrower in a safe area before
returning it to service.
13
Medium Frame 2 & 3 Stage Snow Throwers
Figure 2.16
Hex Screws
Adjustment
Brackets
Auger and Drive Cable Adjustments (500, 600 and 3-wheel Track Drives)
NOTE: Prior to servicing or replacing any belt s, stop
the engine and allow it to cool. Then disconnect spark plug and ground it to the engine
1. Loosen the hex screws that secure the bracket that
guides the cable needing adjustment using a 3/8”
wrench. See Figure 2.16.
2. Slide the bracket up to add slack to the cable or
down to add tension to the cable.
NOTE: The cables should be straight, without ten-
sion when the handle is not engaged.
NOTE: If either bracket reaches the end of its travel
without achieving correct adjustment, use a
straight-edge to confirm that the handle bars
are not bent.
3. When adjusted correctly, the cables should not have
any slack. They should also not be under tension
while in the disengaged position.
NOTE: The speed selector sho uld be able the travel
through its full range of travel without binding.
IMPORTANT: Creep in the drive or auger systems
is unacceptable and must be fixed
before returning to service.
4. Test run the unit in a safe area before returning it to
service.
14
Belts and Cables
Figure 2.17
Auger Cable Adjustments (2-wheel Track Drives)
Check the adjustment of the auger control:
1. When the Auger Control Lever is released, in the
disengaged or “up” position, the cable should have
very little slack. It should not be tight.
2. In a well-ventilated area, start the snow thrower
engine.
3. While standing in the operator’s position, behind the
snow thrower, engage the auger.
4. Allow the auger to remain engaged for approximately ten seconds before releasing the auger control. Repeat this several times.
5. With the throttle control in the FAST (rabbit) position
and the auger control in the disengaged or “up”
position, walk to the front of the machine.
6. Confirm that the auger has completely stopped
rotating and shows no signs of motion.
IMPORTANT: If the auger shows any signs of rotating, return to the operator’s position and shut of f the engine
and wait for all moving parts to stop before readjusting the auger control.
To adjust the Auger Control Cable:
1. Loosen the hex jam nut on the Auger Control Cable “Z” fitting. See Figure 2.17.
2. Without turning the cable, thread the ferrule up or down the “Z” fitting u ntil there is no slack in the cable without pulling on the auger idler pulley..
• Hold the flats on the ferrule with pliers and tighten the jam nut against the ferrule.
• Do not over-tighten the cable.
3. Repeat steps 2 through 6 above until proper adjustment has been achieved.
Drive Cable Adjustments (2-wheel Track Drives)
Check the adjustment of the drive control by:
1. With the Drive Control Lever released, in the disengaged or “up” position, push the snow thrower gently forward. The unit should roll freely.
2. Engage the drive control and gently attempt to push the sno w thrower forward. T he tr acks shou ld not tur n and
the unit should not roll freely.
3. Release the drive control and move the shift lever back and forth between the R2 positio n an d the F6 po sition
several times. The shift lever should move easily.
If any of the above tests failed, the drive cable is in need of adjustment. Proceed as follows:
1. To adjust the drive, loosen the hex jam nut on the auger control cable “Z” fitting. See Figure 2.17.
2. Thread the ferrule without turning the cable onto the “Z” fitting until there is no slack in the cable.
• Hold the flats on the ferrule with pliers and tighten the jam nut against the ferrule.
• Do not over-tighten the cable.
3. Rotate the coupling end of the cable counterclockwise to loosen the tension or clockwise to increase the tension on the cable.
4. Tighten the hex jam nut.
5. Re-check the adjustment of the Drive Control Cable, as described above, to verify proper a djustment has been
achieved.
15
Medium Frame 2 & 3 Stage Snow Throwers
Figure 2.18
Figure 2.19
Figure 2.20
Speed Selector Cable
To adjust the Speed Selector Cable:
NOTE: Inspect the drive platter and friction wheel
before adjusting the speed sector cable.
Ensure that the friction wheel can freely
travel through the whole range of positions.
NOTE: A damaged or binding friction wheel can
mimic a speed selector cable that is out of
adjustment.
1. Place the shift lever in the fastest forward speed
position.
2. Loosen the hex nut on the Shift Cable Index Bracket
and pivot the bracket downward until the slack in the
cable is gone. See Figure 2.18.
3. Tighten the hex nut.
To remove/replace the Speed Selector Cable:
1. Stop the engine and allow it to cool. Disconnect the
spark plug wire and ground it to the engine.
2. Drain the fuel into an approved container.
3. Carefully tip the snow thrower forward so it rests on
the auger housing opening.
4. Remove the bottom access panel.
5. Place a block of wood on the left side of the drive
wheel to hold the shifter arm stationary. See Figure
2.19.
6. Release the tension on the Speed Selector Cable
with two 7/16” wrenches. See Figure 2.20.
NOTE: Older production units only have one hole
for the speed selector cable, as seen in Figure 2.20. Current production models have
three holes. The extra holes were added to
expand the adjustment range to the cable.
16
Belts and Cables
Figure 2.21
Screw
Nut
Figure 2.22
Hair pin clip
Figure 2.23
7. Loosen the cable screw and nut enough to free the zfitting from the from the Speed Control Pivot Bracket.
See Figure 2.21.
8. Remove the hair pin clip from the cable end. See Figure 2.22.
NOTE: Early production units have a hex screw securing
the barrel side of the cable to the shifter handle.
NOTE: The bracket securing the cable to the shift lever is
two pieces
9. Install the cable by following the previous steps in
reverse order.
10. Adjust the cable by following the procedures
described in the Speed Control Cable adjustment
section of this chapter.
11. Test run the snow thrower in a safe area before
returning it to service.
17
Medium Frame 2 & 3 Stage Snow Throwers
Figure 2.24
Hair Pin Clip
Figure 2.25
Speed Selector Rod
To adjust the Speed Selector Rod:
NOTE: Inspect the drive platter and friction wheel
before adjusting the Speed Selector Cable.
Ensure that the friction wheel can freely
travel trough the whole range of positions.
NOTE: A damaged or binding friction wheel can
mimic a speed selector cable that is out of
adjustment.
1. Place the Speed Selector Lever in the fastest forward speed position.
2. Remove the hair pin clip and washer from the upper
end of the selector rod. See Figure 2.24.
3. Slide the ferrule out of the speed selector leve r.
4. Loosen the jam nut.
5. Adjust the ferrule until the ferrule lines up with the
hole in the speed selector lever without pulling on
the rod. See Figure 2.25.
NOTE: When adjusted, the rod needs to be parallel
with the axis of the snow thrower.
6. Reinstall the washer and hair pin clip.
7. Test run the unit in a safe area before returning it to
service.
18
Belts and Cables
Figure 2.26
Figure 2.27
Ball Joint
To remove/replace the Speed Selector Rod:
1. Place the shift lever in the fastest forward speed position.
2. Remove the hair pin clip and washer from the upper
end of the Selector Rod. See Figure 2.26.
3. Slide the ferrule out of the Speed Selector Lever.
4. Remove the nut that secures the ball joint on the end
of the selector rod to the selector assembly, using a
1/2” wrench. See Figure 2.27.
5. Slide the ball joint out of the Selector Assembly.
6. Install the Selector Shaft by following the previous
steps in reverse order.
NOTE: The ball joint is a wear item. MTD recommends
replacing the ball joint when installing the Speed
Selector Shaft.
7. Adjust the shaft by following the procedures
described in the previous section of this chapter.
8. Test run the unit in a safe area before returning it to
service.
19
Medium Frame 2 & 3 Stage Snow Throwers
Figure 2.28
Alignment marks
Figure 2.29
”
3/4””
Wrench
1/2”
Wrench
Figure 2.30
“D” hole
Auger and Drive Lever Interlock
To remove/service the Auger And Drive Lever Interlock:
1. Loosen, but do not remove the two screws ho lding
the auger cable using a 3/8” socket. See Figure
2.28.
NOTE: Place an alignment mark on the adjustment
bracket and the frame for reassembly.
2. Remove the Z-fitting from the Auger Control Lever
with a pair of needle nose pliers.
3. Remove the shoulder bolt using a 3/4” wrench and a
1/2” wrench. See Figure 2.29.
4. Carefully release the tension from the torsion spring
as the bolt is withdrawn.
5. Repeat the previous step on the drive control lever.
6. Detach the pivot rod from the Clutch Lock Cam. See
Figure 2.30.
NOTE: The flats at each end of the pivot rod fit into
the “D” hole in the cam lock.
7. Slide the rod out of the handle panel.
20
Belts and Cables
Figure 2.31
Powdered metal end
Nail headed
Figure 2.32
Clutch Lock Cam
Shoulder nut
Hex key
NOTE: The pivot rod for early production models were nail
headed. Current production models have a powered medal end. See Figure 2.31.
NOTE: The shoulder nuts are attached to the clutch lock
cams with a socket head screw. The screw can be
removed using a 3/16” hex key.
NOTE: If the socket head screw is over torqued, the screw
head will sink into the plastic material of the Clutch
Lock Cam. The socket head screw will also prevent the shoulder bolt from threading into the
shoulder bolt all the way.
NOTE: If the socket head screw is too loose, the Clutch
Cam Lock will not operate the Auger Control
Lever.
8. Install the interlocks by following the previous procedures in reverse order.
9. Test run the unit in a safe area before returning it to
service.
21
Medium Frame 2 & 3 Stage Snow Throwers
22
Axle Assemblies
Figure 3.1
Axle Support
Tube
Axle Shafts
Figure 3.2
Hex drive shaft
Axle
500 Series Drive System
Chapter 3: 500 Series Drive System
NOTE: Units with steerable drive wheels have a split axle
to allow each wheel to be driven independently of
each other. See Figure 3.1.
To remove the axles:
1. With the engine stopped and allowed to cool, disconnect the spark plug wire and ground it to the engine.
2. Drain the fuel into an approved container.
3. Carefully tip the snow thrower forward, so it rests on
the auger housing opening.
4. Remove the bottom access panel. See Figure 3.2.
23
Medium Frame 2 & 3 Stage Snow Throwers
Figure 3.3
Figure 3.4
Spacer
Bushing
Hex
Figure 3.5
5. Remove the wheels using a 1/2” wrench.
NOTE: The ends of the axle shafts ar e a double -D.
See Figure 3.3.
6. Slide the spacers off of the axle. See Figure 3.4.
7. Carefully pry the 2 split bushings from the axle. See
Figure 3.5.
24
500 Series Drive System
Figure 3.6
56 tooth gear
Spacer
Woodruff
key
8. Slide one of the large 56T gears inward, while gently
pulling the axle outward enough to expose the key
that engages the gear. See Figure 3.6.
9. Remove the key.
10. Hold the axle support tube and pull the shaf t from the
housing.
11. Repeat steps 8 through 10 for the opposite axle.
NOTE: Examine the removed parts: If failed because of
something other than normal wear, identify and
correct the cause before returning the snow
thrower to service
12. Install the axle assemblies by following the previous
steps in reverse order.
13. Test run the snow thrower in a safe area before
returning it to service.
25
Medium Frame 2 & 3 Stage Snow Throwers
Figure 3.7
Figure 3.8
Figure 3.9
Planetary Gear Sets
Drive Gears
Hex Drive Shaft
To remove/replace a Hex Drive Shaft:
1. Stop the engine and allow it to cool, disconnect the
spark plug wire and ground it to the engine.
2. Drain the fuel into an approved container.
3. Carefully tip the snow thrower forward, so it rests on
the auger housing opening.
4. Remove the access panel using 3/8” wrench.
5. Remove both wheels using a 1/2” wrench.
6. Remove the axle assembly by following the procedure described in the previous section of this cha pter.
7. Remove the four screws that hold the right side
Shaft Retainer Housing. See Figure 3.7.
NOTE: In order to remove the housing, it may be
necessary to squeeze the steering trigger to
release the dog assembly from the planetary
ring gear.
8. Rotate the entire Friction Wheel Assembly backwards to it from the Shifter Assembly.
9. Maneuver the entire drive assembly to the left,
enough for the right side to clear the frame, then
remove. See Figure 3.8.
10. The complete drive assembly has two housings on
each side, commonly referred to as the planetary
gear sets. See Figure 3.9.
NOTE: Each drive gear drives one half of the split
11. Install the hex drive shaft by following the previous
steps in reverse order.
axle.
12. Test drive the snow thrower in a safe area before
returning it to service.
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