MTD Series 250 Service Manual Download Page 19

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Vertical Crankshaft Front Tine Tiller

SEAL REPLACEMENT

NOTE:

Replacement of the seals can be done

without removing or disassembling the transmis-
sion.

NOTE:

Drain fuel from the fuel tank.

NOTE:

If the seal on the left side needs replace-

ment, drain the engine oil as well.

6.1.

Position the tiller on its side, with the seal to be
replaced facing up. Remove tines from tine
shaft. See Figure 6.1.

NOTE:

It may be necessary to clean the tine

shaft with emery cloth prior to removing the seal.

6.2.

Use seal puller tool or heavy screw driver to get
a hold on the old seal.
See Figure 6.2.

NOTE:

Use caution not to score the shaft.

Figure 6.1

Figure 6.2

6.3.

After the seal is free from the transmission
housing it is possible to slide the seal off by
hand.
See Figure 6.3.

6.4.

When the old seal has been removed examine
the tine shaft to for damage to the sealing sur-
face. If the shaft is damaged there are two
options:

•

Replace the shaft.

•

Repair the shaft with a locally purchased “Reddi-
sleeve” or similar product.

6.5.

Use old micro fiche or similar material to protect
the seal as it slips over the tine shaft.
See Figure 6.5.

Figure 6.3

Figure 6.5

Summary of Contents for Series 250

Page 1: ...s 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 ...

Page 2: ......

Page 3: ...Introduction 1 Tines 3 Clutching Mechanism 4 Gearbox Removal and Replacement 7 Gearbox Maintenance and Repair 9 Seal Replacement 15 TABLE OF CONTENTS ...

Page 4: ......

Page 5: ...l a counter rotating tine tiller is better suited to that task The vertical crankshaft design yields savings in engine cost See Figure 1 2 1 3 Description The standard forward rotating tines are driven by a set of worm gears within the transmission The tines can be adjusted to till a swath that varies from 13 33cm to 24 61cm The clutching media is a belt that is ten sioned between two halves of a ...

Page 6: ...m version has a disc on the end of the tine shaft to confine trail ings See Figure 1 6 1 7 The disc can be removed See Figure 1 7 1 8 The tines can be reconfigured See Figure 1 8 1 9 There is also a T 210 35cm 40cm version roughly 50 larger than a mini cultivator See Figure 1 9 Figure 1 6 Figure 1 7 Figure 1 8 Figure 1 9 ...

Page 7: ... the dirt as they enter it If the tines are reversed left right they will hook into the dirt too aggressively See Figure 2 4 2 5 Keep the tine shaft clear of wire fencing mono filament clothesline and other material that may wrap around the shaft 2 6 Penetrating oil may be used to loosen tines that are corroded to the tine shaft Lubricating the tine shaft before storage will help prevent this cond...

Page 8: ...l steps Remove the 6 bolts and locking nuts that hold the clutch housing to the rest of the tiller using a pair of 9 16 wrenches Lift the engine and clutch housing from the tiller and place them on a flat level surface without constraining the cable If the engine is to be inverted drain the gasoline from the fuel tank 3 5 To remove the cable detach the cable from the handlebars by pushing the barb...

Page 9: ...Remove the 3 4 hex shoulder bolt and 9 16 lock nut on top side of clutch housing See Figure 3 13 Figure 3 9 Snap ring Figure 3 13 Shoulder bolt Idler return spring 3 14 Lift the idler bracket and belt out of housing See Figure 3 14 3 15 Remove the lock nut from the stud by using a 9 16 wrench See Figure 3 15 NOTE Belt keeper tabs perform a braking func tion when the belt is released NOTE Belt pt 7...

Page 10: ...from the engine using a 9 16 wrench 3 19 On installation apply thread locking compound such as Loctite 242 blue the threads and tighten to torque of 250 270 in lbs 28 30 n m 3 20 With the engine and clutch housing removed the tine shield can be lifted off of the tiller See Figure 3 20 NOTE There are two dowels that locate the tine shield to the tiller transmission 3 21 If it is necessary to remove...

Page 11: ...0 270 in lbs 28 30 n m Figure 3 22 Pulley adaptor Lower Pulley Double D Shaft 4 GEARBOX REMOVAL AND REPLACEMENT NOTE The tiller gear box is subject to the like kind exchange program providing that the fail ure is warrantable NOTE Outside of warranty the repair vs replacement will be at the discretion of the end user and the repair shop 4 1 Begin the transmission removal process by Removing the eng...

Page 12: ...a pair of 1 2 wrenches 4 6 Remove 2 bolts that hold the depth bar bracket on the gearbox using a pair of 9 16 wrenches 4 7 To install the replacement gearbox simply reverse the removal process See Figure 4 7 NOTE When Making service or replace deci sion about the gearbox carefully evaluate the value of the tiller If any major damage is discovered to the case the bronze gear or the worm shaft repai...

Page 13: ...l plug Figure 5 3 5 4 When filling the gear box with the gear lube be sure that the gear box is upright position the oil level will come up halfway on the tine shaft 5 5 Drain and properly dispose of the gear lube if the transmission is to be serviced Refill it to the proper level upon completion 5 6 Before attempting to split the housing clean the tine shaft Remove all dirt rust and scale using e...

Page 14: ...nze gear 5 10 Lift the bronze gear out of the housing after the tine shaft has been removed See Figure 5 10 NOTE Gear tooth profile is concave to mate with worm gear 5 11 Inspect the bronze gear bronze tine shaft bear ings tine shaft and housings for significant wear or damage 5 12 Remove and inspect worm input shaft for wear or damage to bearings See Figure 5 12 Figure 5 8 Shim 060 Figure 5 9 Hi ...

Page 15: ...ings are in need of replacement prior to taking out seals you can press the seals out at the same time your remov ing the bushing Figure 5 13 Figure 5 14 5 15 When installing new bushings press them in so that the end of the bushing is even with the inside boss of the housing See Figure 5 15 NOTE Bushing part number 741 04139 NOTE If the tiller is need of tine shaft bearings and the correct bearin...

Page 16: ...ved from the housing 5 19 Fixture the shaft in a bench vise and apply heat to the socket head cap screw to release the threadlockingcompound SeeFigure5 19 NOTE Some tillers may have a hex head cap screw at this location 5 20 With the screw and heavy washer removed the sheave half can be lifted away along with the adapter See Figure 5 20 5 21 With the adaptor removed the shim washers seal and seale...

Page 17: ... Figure 5 22 Figure 5 24 Bearing Shim washers Oil seal 5 26 Test fit the worm shaft assembly in the housing Check end play End play should be 0 0 014 36 mm See Figure 5 26 NOTE The closer to zero end play the better 5 27 Add or remove shims p n 736 0266 and 736 04186 to achieve correct end play Generally this will not require adjustment 5 28 Remove the worm shaft from the housing fixture it in a b...

Page 18: ... mating surfaces of the case halves See Figure 5 33 5 34 Position the second half of the housing and secure it using the 12 screws previously removed Tighten the screws to a torque of 90 120 in lb 10 13 n m See Figure 5 34 5 35 Install the tine shaft seals See Figure 5 35 5 36 Drive the seals all the way in so that they seat against the shoulder in the bore 5 37 Re fill the case with 12 fl oz of 8...

Page 19: ... to removing the seal 6 2 Use seal puller tool or heavy screw driver to get a hold on the old seal See Figure 6 2 NOTE Use caution not to score the shaft Figure 6 1 Figure 6 2 6 3 After the seal is free from the transmission housing it is possible to slide the seal off by hand See Figure 6 3 6 4 When the old seal has been removed examine the tine shaft to for damage to the sealing sur face If the ...

Page 20: ...al down to the transmission 6 7 Slide the film out of the seal See Figure 6 7 NOTE Start the seal in the bore with gentle thumb pressure 6 8 Drive the seal home against the with Seal installer tool from the Troy Bilt tiller tine shaft tool kit TWX 4006 See Figure 6 8 6 9 Install the tines 6 10 Confirm correct gear lube and engine oil levels 6 11 Run and test the tiller before delivery to the cus t...

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