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Transmission Overhaul

29

15.

Remove the four hex flange screws holding the rear
transmission cover to the transmission housing,
using a 1/2” wrench. See Figure 6.6.

16.

Wedge a sharp 5-in-1 painters tool or putty knife in
between the cover and the transmission housing.

17.

Pry the cover off.

18.

Clean the gasket from the rear transmission housing
and cover.

NOTE:

The rear cover does not have a fill plug.

19.

Remove the tine shaft oil seals from the transmission
housing . See Figure 6.7.

20.

Remove the snap rings that secure the tine shaft
bearings, using a pair of snap ring pliers.
See Figure 6.8.

21.

Push the tine shaft to the right, forcing the right tine
shaft bearing out of the transmission housing.

NOTE:

The bearing is a slip fit. If it is stuck, use a block of

wood and a large hammer.

NOTE:

The washer will be damaged by the Hi-Pro key.

22.

Remove the bearing and washer from the right side
of the tine shaft.

23.

Slide the tine shaft back into the housing until the Hi-
Pro key contacts the tine shaft worm gear.

24.

Rotate the tine shaft until the Hi-Pro key slides into
the worm gear keyway.

Figure 6.6

Rear transmission cover

Figure 6.7

Thexton seal removal tool

Figure 6.8

Snap ring

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Summary of Contents for RT-75

Page 1: ...e 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 ob...

Page 2: ......

Page 3: ...pter 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 Table of Contents ...

Page 4: ...II ...

Page 5: ...f 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 ...

Page 6: ...d 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...

Page 7: ...s 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 refer ence guide as well as a step by step procedure guide that does not require the user to hunt for informa tion Lubricant quantity and specification may be noted in the part of the text that covers maintenance and again in the section that c...

Page 8: ... 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 per sonnel 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 ser...

Page 9: ...n 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 y...

Page 10: ...RT 75 6 ...

Page 11: ...e 2 Remove the two screws that secure the belt cover See Figure 2 1 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 See Figure 2 2 6 Slide the reverse belt past the belt guards and off of the idler pulley Figure 2 1 screws Figure ...

Page 12: ...elts 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 reverse cable Z fitting from the reverse idler bracket 11 Remove the reverse idler bracket using a 1 2 wrench See Figure 2 5 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 th...

Page 13: ...elts 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 See Figure 2 7 16 Test run the tiller in a safe area before returning it to service Figure 2 6 7 8 nut Figure 2 7 forward drive belt reverse belt h...

Page 14: ...RT 75 10 Belt Routing Forward drive belt Reverse drive belt Transmission pulley Engine Pulley ...

Page 15: ...See Figure 3 1 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 neces sary to release the drive bail See Figure 3 2 Figure 3 1 reverse lever forward drive bail Figure 3 2 Reverse lever hitting the drive bail CHAPTER 3 CABLE...

Page 16: ...e 3 3 NOTE A ford fuel line tool is useful to compress the 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 Figure 3 3 Disconnect the cable fitting Figure 3 4 Ford fuel line tool Figure 3 5 Remove these screws washer ...

Page 17: ...re 3 6 9 Unhook the spring end of the cable from the forward idler bracket 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 Figure 3 6 Loosen this screw Disconnect this cable Figure 3 7 Disconnect cable ...

Page 18: ...r to prevent the slot in the cover from opening up as the screw is tightened 5 Swing the belt cover up and off of the tiller 6 Slide the forward drive belt off of the engine pulley 7 Slide the reverse belt off of the idler pulley 7a Loosen the nut and bolt that secures the idler pulley to the idler bracket 7b Slide the belt past the belt guides 8 Loosen but do not remove the screw securing the cab...

Page 19: ...m the cable bracket See Figure 3 11 10 Disconnect the cable Z fitting 11 Install the reverse cable by following the previous steps in reverse order 12 Test run the tiller in a safe area before returning it to service Figure 3 11 Disconnect this cable ...

Page 20: ...RT 75 16 ...

Page 21: ...move replace the engine 1 Disconnect and ground the spark plug wire 2 Remove the two screws that secure the belt cover See Figure 4 1 3 Swing the belt cover up and off of the tiller 4 Set the throttle to the full throttle position 5 Remove the throttle cable clamp using a flat headed screwdriver See Figure 4 2 6 Disconnect the throttle cable from the throttle lever Figure 4 1 Remove these screws F...

Page 22: ...everse idler spring See Figure 4 4 11 Unhook the reverse cable Z fitting from the reverse idler bracket 12 Remove the four screws two on each side that secure the front bumper to the frame using a 1 2 wrench 13 Remove the four engine mounting screws using a 1 2 wrench 14 Lift the engine off of the tiller and place it in a safe work area NOTE If replacing the engine continue to the next step Figure...

Page 23: ...n the cable pulley bracket and the screw securing the cable pulley bracket See Figure 4 8 17 Tip the engine to the rear of the tiller and slide the bumper between the engine and the frame 18 Install the four engine mounting screws using a 1 2 wrench 19 Follow steps 1 through 13 in the previous section in reverse order 20 Test run the tiller in a safe area before the tiller is returned to service N...

Page 24: ...RT 75 20 ...

Page 25: ...he engine by following the steps described in Chapter 4 Engine Removal 3 Loosen the forward drive cable pulley using a 3 8 wrench and slide the cable off of the pulley See Figure 5 1 4 Unhook the cable See Figure 5 2 Figure 5 1 Loosen screw and slide cable off of the pulley Figure 5 2 Unhook the cable CHAPTER 5 TRANSMISSION REMOVAL ...

Page 26: ...E Any time the wheels are removed or once a year the wheel shafts should be coated with anti seize or grease 8 Remove and discard the cotter pin that holds the neutral lever to the transmission shifter fork See Figure 5 5 Figure 5 3 idler bracket spring Figure 5 4 Support the wheel shafts with wood blocks Figure 5 5 cotter pin Neutral lever ...

Page 27: ...me rails to the transmission using a 1 2 wrench See Figure 5 7 11 Loosen but dot remove the handle mount nuts and bolts 12 Remove the two screws that hold the depth bar bracket to the rear of the transmission using a 1 2 wrench See Figure 5 8 Figure 5 6 Drag bar Remove nut and bolt Figure 5 7 screws handle mount nuts and bolts Figure 5 8 Remove these screws ...

Page 28: ...14b Slide the tines off of the shaft NOTE Any time the tines are removed or once a year the tine shafts should be coated with anti seize or grease NOTE When installing the tines make sure the curve of the tine is facing the direction of rotation See Figure 5 11 Figure 5 9 Figure 5 10 Bow tie clip Figure 5 11 Direction of rotation Front of tiller Curve of the tine ...

Page 29: ...emove the idler bracket using a 1 2 wrench See Figure 5 12 16 Install the transmission by following the previous steps in reverse order 17 Test run the tiller in a safe area before returning it to service Figure 5 12 idler bracket ...

Page 30: ...RT 75 26 ...

Page 31: ... using a 1 2 wrench See Figure 6 1 2b Wedge a sharp 5 in 1 painters tool or putty knife in between the cover and the transmission housing 2c Pry the cover off 2d Turn the transmission over and drain the oil into a suitable container 2e Allow all of the gear oil to drain from the trans mission NOTE The front cover has a fill plug 3 Secure the transmission in a soft jawed vise 4 Clean the gasket fro...

Page 32: ... the side cover into the transmission housing 10 Push the wheel shaft to the right forcing the right wheel shaft bearing out of the transmission housing NOTE The bearing is a slip fit It may take several tries of pushing the wheel shaft to the right while wiggling it to walk the bearing out of the transmission housing 11 Remove the bearing and washer from the right side of the wheel shaft 12 Remov...

Page 33: ...e the snap rings that secure the tine shaft bearings using a pair of snap ring pliers See Figure 6 8 21 Push the tine shaft to the right forcing the right tine shaft bearing out of the transmission housing NOTE The bearing is a slip fit If it is stuck use a block of wood and a large hammer NOTE The washer will be damaged by the Hi Pro key 22 Remove the bearing and washer from the right side of the...

Page 34: ... using a 1 2 wrench See Figure 6 9 NOTE The top two screws were removed with the depth bar bracket 29 Using a brass punch and hammer rotate the rear bearing cap to break the seal See Figure 6 9 30 Once the rear bearing cap is rotated enough to allow access to one of the corners use the brass punch to drive the cover off 31 Clean the sealant from the rear of the transmission housing and the bearing...

Page 35: ...shaft assembly rearward and out of the transmission assembly NOTE The front tapered roller bearing should come out with the drive shaft If it did not remove it from the transmission housing NOTE Inspect the front tapered roller bearing for wear or damage Inspect the drive shaft Check the operation of the one way clutch 38 Remove the tine shaft worm gear 39 Remove the wheel shaft worm gear and neut...

Page 36: ...il seal using a flat blade screwdriver 45 Remove the front internal snap ring using snap ring pliers 46 Remove the front tapered roller bearing race by lightly tapping on the perimeter using a blunt ended punch and a hammer or a bearing driver 47 The race should be gently pushed into the center of the transmission housing for ease of removal 48 Clean and inspect all of the parts for signs of wear ...

Page 37: ...thickness of the hood bracket NOTE Measure the thickness of both washers using a dial caliper See Figure 6 16 6 Install the front snap ring using snap ring pliers 7 Lubricate and install the front tapered roller bearing race into the front of the transmission housing It should seat up against the front retaining ring See Figure 6 17 NOTE The front race is installed from inside the transmis sion ho...

Page 38: ...to the wheel shaft so that it rests against the snap ring on the side opposite of the splines NOTE The dog clutch side of the worm gear must face the splines when it is installed See Figure 6 20 10c Install a snap ring in the groove next to the worm gear 10d Slide the dog clutch collar onto the spline side of the wheel shaft with the dogs facing the worm gear See Figure 6 21 Figure 6 19 Snap ring ...

Page 39: ...the drive shaft 14 Slide the drive shaft into the transmission housing from the rear opening 15 Apply a 3 16 4 75mm bead of Threebond 1217H Permatex Ultra Black 82180 or equivalent sealant on the side cover 16 Install the side cover Tighten the screws to a torque of 110 125 in lbs 12 14 Nm 17 Install the left side wheel shaft bearing 18 Install the snap ring that retains the left wheel bearing usi...

Page 40: ... rear tapered roller bearing See Figure 6 26 29 Set the rear bearing cap in position NOTE Do not put sealant on the bearing cap 30 Fasten the rear bearing cap to the transmission housing with the hex flange screws using a 1 2 wrench NOTE The washers from step five go on the top two screws 31 Tighten the hex screws to a torque of 100 in lbs 11 Nm NOTE The drive shaft rides in a pair of tapered roll...

Page 41: ... total shaft end play measurement This is the thickness of the stack of shims that should be used between the rear bearing cap and the bearing race 32g Remove the rear bearing cap and install the stack of shims described in step 32f 32h Fasten the rear bearing cap to the transmission housing with the hex flange screws using a 1 2 wrench 32i Tighten the hex screws to a torque of 100 in lbs 11 Nm 32...

Page 42: ...ntil the sealant has cured Then they should be removed 35 Verify the end play is between 0 005 0 015 by repeating step 32a through step 32e 36 Install both of the wheel shaft seals 37 Install both of the tine shaft seals 38 Fill the transmission with 30 oz 0 9 L of 85W 140 gear lube 39 Install the transmission covers using new gaskets 40 Install the transmission in the tiller 41 Test run the tille...

Page 43: ...es are installed backwards the tines will hammer the ground making the machine hard to control and will not till the soil See Figure 7 1 As the tines dig through the ground the grinding action of the soil will put a sharp edge on the tines Once the tine has been ground to a sharp point it must be replaced See Figure 7 2 Figure 7 1 Euro tines Figure 7 2 New Worn Sharp point CHAPTER 7 TINES ...

Page 44: ... on the transmission See Figure 7 4 NOTE Replace the nut and bolt if they show signs of wear or damage 3 Slide the assemblies off of the tine shaft NOTE If the hub assemblies are frozen to the tine shaft a hub puller can be used to remove them 4 Remove the old tines from the tine assembly with a pair of 1 2 wrenches See Figure 7 5 Figure 7 3 Figure 7 4 bow tie clip Clevis pin Figure 7 5 1 2 wrench...

Page 45: ...ee Figure 7 7 6 Install two left hand tines and two right hand tines to the flange closest to the shoulder end See Figure 7 8 7 Install four right hand tines on the outside flange of the left hand tine assembly 8 Install four left hand tines on the outside flange of the right hand tine assembly NOTE The inside of the curve of the tine should face the center of the flange NOTE Tighten the nuts and ...

Page 46: ...he outside tines should curve inward The tines should be bolted to the outboard side of the plate on the tine holder See Figure 7 9 12 Insert the tine hood end panel Secure it with the center wing nut 13 Install the side shield Secure it with the remaining wing nuts 14 Test the tiller in a safe area before returning it to service Figure 7 9 clevis pin Figure 7 10 Side shield center wing nut ...

Page 47: ...e handle bar by following the procedures described in Chapter 3 Cables 2 Remove the nut and bolt that secures the throttle lever to the handle bar using a pair of 7 16 wrenches See Figure 8 1 3 Unthread the swivel rod knob See Figure 8 2 Figure 8 1 throttle lever Figure 8 2 swivel rod knob CHAPTER 8 SWIVEL HANDLE ...

Page 48: ...r pin that secures the swivel rod to the swivel latch See Fig ure 8 4 NOTE Do not remove the inner cotter pin 6 Remove the swivel rod and washer 7 Remove the handle adjustment crank See Figure 8 5 Figure 8 3 cable ties Figure 8 4 inner cotter pin outer cotter pin washer Figure 8 5 handle adjustment crank handle mounting bolt ...

Page 49: ...e 8 6 8 Remove the handle mounting nut and bolt 9 Remove the handle bar from the machine 10 If replacing the handle bar 10a Remove the forward drive bail 10b Remove the reverse lever 10c Remove the front cover and swivel rod bracket 11 Install the handle bar by following the previous steps in reverse order 12 Test run the unit in a safe area before returning it to service Figure 8 6 nut retension ...

Page 50: ...ld the swivel assembly on the machine Having the lower bracket mounted to the frame provides stability while torquing the lower nut 2 Remove the upper jam lock nut from the swivel assembly using a 15 16 wrench See Figure 8 7 3 Remove the flat washer See Figure 8 8 4 Remove the lower nut using a 15 16 wrench See Figure 8 9 Figure 8 7 upper jam lock nut Figure 8 8 flat washer Figure 8 9 lower nut ...

Page 51: ... the lower bracket is damaged or worn remove and replace it by removing the four nuts and bolts that hold it down using a pair of 1 2 wrenches See Fig ure 8 12 To reassemble the swivel bracket assembly 10 If removed install the lower bracket assembly 11 Apply a generous coating of anti seize compound to the lower bracket assembly where the upper and lower brackets make contact Figure 8 10 Bellevil...

Page 52: ...o a torque of 240 270 in lbs 27 31 Nm See Figure 8 13 16 Install the flat washer 17 Install the upper locking jam nut 18 Install the handle bar by following the procedures described in the previous section of this chapter 19 Test run the unit in a safe area before returning it to service Figure 8 13 Torque to 240 270 in lbs Belleville washer locking jam nut ...

Page 53: ......

Page 54: ...MTD Products Inc Product Training and Education Department FORM NUMBER 769 09590 00 12 2013 ...

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