Instruction/ maintenance manual of the product 643 MTD
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Snow Thrower Model s 643 & 663 IMPORT ANT : READ SAFETY RULES AND INSTRUCTIONS CA REFULL Y MTD LL C P .O . B O X 36 11 31 CL EVEL AND, OHIO 44 136-0 01 9 Wa rn in g: This uni t is e quip ped wit h.
2 TAB LE O F CON TEN TS Conten t Page Import ant Sa fe Ope ratio n Pract ices ..... ..... .... ... .... ..... ..... .. ..... ..... .... ... ..... .... ..... .. . 3 Assembl ing Yo ur Snow Thrower .... ..... .. ..... ..... .... ... ..... .... ..... ....
3 SECT I ON 1: I M PORT AN T SAF E O PER ATI ON PR AC TICE S This symbol poin ts ou t i m portant safety instructions, which if not followed, co uld endanger the personal safety and/or property of yourse lf an d others. Read and foll ow all i n structions in this manual before attempting to operat e this m achine.
4 4. Never oper ate wi th a missi ng or damag ed disch arge chute . Keep al l safety devic es in place and wo rking. 5. Never ru n an engi ne indoo rs or in a poorly ventila ted area. Engine exhaust contains ca rbo n monoxide , an odorl ess and d eadly ga s.
5 SECTION 2: ASSEMBLING YOUR SNOW THROWE R NOTE: References to right or l eft side of the snow thrower are determined from behind the unit i n the operating position. The “operator’s position” is defined as standing directly behind the s now thrower, facing the handle panel.
6 SECTION 3: KNOW YOUR S NOW THROWER Fi gur e 5 WARNING: Read , understand, and follow all in structio ns and w ar nings on the ma chi ne an d i n th is man ual bef ore oper ating. T ractio n Control / Au ger Con trol Lock The traction control is locate d on the right handle.
7 Headlight The headlight is on whe never the engine is running. Throttle C ontrol The throttle control is located on the engine . I t regulates the speed of the eng ine and will shut off the engine when pushe d down completely.
8 Recoil Starte r • Rotate choke kno b to FULL chok e position (cold engine sta rt). I f engine is warm, place choke i n OFF positio n instead of FULL. • Push primer button t wo or three times. If engine is warm, pus h primer b utton once only . NOTE: A lways cover vent hol e in pri mer button whe n pushing.
9 Fi gur e 6 Chut e Clean- Out T ool The chut e clean-out tool is convenient ly fastened t o the rear of the auger hous ing with a mounting clip. Should snow and ice lodge its elf i n the discharge ch.
10 SECTION 5: MAKING ADJUSTMENTS WARNING: N EVER a t temp t to make any adjustmen ts while the engin e is running, except whe re specified in the operato r ’ s manual . Ti re P res s u re (Pne u matic Tires) • The tires are overinflated for shippin g purposes.
11 Shift Rod A djustment To adjust the shift rod, proceed as fo llows: • Remove th e hairpin clip and slide the shift rod conn ector up, to separate the upper shift rod from the lower shift rod. See F igure 10. Figu re 10 • Place the shift lever into the sixth (6) position.
12 wheel hub.This position gives p ower drive to the left wheel only, ma king the unit easier to maneu ver. Both Whe els Drivin g • Rotate whee l assembly to alig n hole in t he hub wi th the inner hole on the ax le shaft. Insert klick pin in the hol e.
13 Tractio n Control / Auge r Co ntrol Lock The cams on th e ends of the control rods which interlock the traction drive and aug er d rive controls must be lubricated at least once a season or every 2 5 hours of o peration. T he cams can be accessed benea th the handle panel.
14 • Drain the gasoline from the s now thrower, or place a piece of pl astic film under the gas cap. • Tip the snow thrower up and f orward s o that i t rests on its auge r housing. • Remove th e six self-tapping screws from the frame cover unde rneath the snow thrower.
15 Figu re 20 • Remove th e four screws from the friction wheel assem bly. Remove the friction wheel rubber from betwee n the friction wheel plates. See Fi gure 21. • Reassem ble the new friction wheel rubber to the friction wheel p lates and hub, tighten ing the six screws in rotation and with equal force.
16 SECTION 8: TROUBLE SHOOTING NOTE: For repairs beyond the mi nor adjustments abo ve, contact your local autho r i zed service dealer. T rouble Possible Cau se( s) Co rrec tive Act ion Engine f ails t o star t Fuel ta nk empty, or st ale fuel . Blocked fuel li ne.
17 2 12 4 6 7 10 9 14 11 8 16 1 3 15 Models 643 & 663 5 13 3 17 Ref. No. P ar t No. Part Description 1. 618-01 23 RH Housing 2. 618-01 24 LH Housing 3. 71 0-0642 Self T apping Scre w , 1/ 4-20 x .75 4. 711-09 10A Spir al Ax le, 28 ” 5. 714-01 61 Hi-Pr o Ke y , 3/16 x 5/ 8 6.
18 Models 643 & 663 14 10 2 14 12 16 3 20 60 63 67 65 55 54 8 17 11 22 21 18 4 1 11 15 19 7 14 53 59 68 69 69 27 82 70 72 72 73 27 68 71 74 27 56 64 76 77 78 79 11 15 75 81 27 83 80 13 13 42 26 26.
19 Models 643 & 663 Ref. No. Part No . Part Descri pti o n 1. 684-0 008A Shift Ar m Assem bly 2. 710-0 458 Carri age Bolt 5/ 16-18 x 1.75 ” 3. 710-0 449 Carri age Bolt 5/ 16-18 x 2.25 ” 4. 710-0 788 TT Screw 1 /4-20 x 1 ” 5. 712-0 429 Hex L ock Nut 5/16 -18 6.
20 Mode ls 643 & 663 1 2 3 4 5 6 7 8 9 10 11 12 14 15 13 16 10 26 18 27 28 13 30 31 32 33 16 18 35 34 36 37 38 39 41 40 42 17 40 39 29 24 9 19 30 31 50 51 52 49 48 47 43 44.
21 Mode ls 643 & 663 Ref. No. P ar t No. P art Descr iption 1. 712-0116 L ock Jam Nut 3/ 8-24 2. 756-0178 F lat I dler 3. 784- 5632B Auger Idler Ar m 4. 710-0459A He x Cap Scr e w 3/8-24 x 1.50 5. 738-0281 Sh oulder Screw 6. 736-0167 W ave Washer 7.
22 Mode ls 643 & 663 1 2 3 4 5 6 7 4 8 9 10 11 12 13 14 15 16 17 18 19 19 16 16 16 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 IMPORTANT: For a prop er working machi ne, use Facto ry Approved Par ts. V-BELTS are spec iall y designed to engage an d dis engage safel y.
23 Mode ls 643 & 663 Ref. No. P art No. Part Description 1. 710- 1652 Hex Was her Screw 1/4 -20 x . 625 2. 731- 1324 Belt Co ver 3. 732- 0710 Extensi on Spring 4. 710- 0627 Hex Screw 5/16-24 x .75 5. 710- 3005 Hex Cap Scr ew 3/8-1 6 x 1.25 6. 0589 6A Dr ive Clutch Idler Br acket 7.
24 Models 643 & 663 1 1 2 3 4 4 5 5 6 16 ” W heel s 13 ” or 15 ” Whee ls 4 7 7 8 9 10 10 11 11 12 41 5 13 14 15 16 17 18 1 19 20 21 22 23 24 25 25 26 28 29 1 1 30 31 32 33 34 8 35 Dri ve Cl .
25 Mode ls 643 & 663 Ref. No. P a rt No. P a rt Description 1. 710-0599 Hex Scr ew 2. 784-5688 Driv e Cabl e Guide Bra ck et 3. 784-5687A Auger C lut ch Cabl e B rac ket 4. 756-0625 Roller C ab le 5. 738-0924 Hex Scr ew 1/4- 28 6. 784-5630B F rame Ass emb ly 7.
26 Notes.
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MANUF A C TURER ’ S LIMITED W ARRANTY FOR: The l imited w arran ty set f or th belo w is giv en by MTD LLC wi th respec t to new merc handise purcha sed and used in th e Unit ed Stat es, its po ssessions and te rritories.
An important point after buying a device MTD 643 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought MTD 643 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data MTD 643 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, MTD 643 you will learn all the available features of the product, as well as information on its operation. The information that you get MTD 643 will certainly help you make a decision on the purchase.
If you already are a holder of MTD 643, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime MTD 643.
However, one of the most important roles played by the user manual is to help in solving problems with MTD 643. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device MTD 643 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
