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Parts Manual
YT Series
Lawn Tractors & Mower Decks
16HP Tractors
Mfg. No. Description
1694368 YT1644, 16HP Hydro
18HP Tractors
Mfg. No. Description
1694369 YT1850, 18HP Hydro
Mower Decks
Mfg. No. Description
1694371 44" Mower Deck
1694372 50" Mower Deck
Rev. 02/2003
TP 400-3821-00-CQ-N
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Table Of Contents TRACTOR / MOWER DECK COMPONENTS PAGES Frame Group ......................................................................................................................... 2 Steering Group - Manual Steering ......................................................................................... 6 Engine & Electric Clutch Group - 16HP Briggs & Stratton, Vanguard ................................... 8 Transmission Group ............................................................
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Frame Group 985881 NOTE: Unless noted otherwise, use the standard hardware torque specification chart. 4 7 1 6 8 5 9 Torque to 150 ft. lbs. 3 (202 Nm) 2 34 33 10 11 14 11 29 12 Torque to 150 ft. lbs. 15 13 16 (202 Nm) 16 17 28 17 18 Torque to 29 55-60 ft. lbs. (74-81 Nm) 36 19 30 35 Service Kit 32 43 23 20 21 1686985 21 38 39 22 31 40 37 43 21 43 41 11 11 42 25 27 21 Torque to 24 22-40 ft. lbs. (30-54 Nm) 26 The above parts group applies to the following Mfg. Nos.: 1694368 - YT1644 1694369
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Frame Group REF NO. PART NO. QTY. DESCRIPTION 1 1721748 1 TOWER & SUPPORT ASSEMBLY 2 1923683 4 CAPSCREW, Hex Washer Head Taptite, 3/8-16 x 3/4 3 1960541 4 CAPSCREW, Hex Washer Head Taptite, 5/16-18 x 3/4 4 1723528 1 SUPPORT, Seat Deck 5 1928352 2 NUT, Hex Flange 3/8-16 Whiz Lock, Large 6 1930644 2 NUT, Hex Flange Two-Way Lock, 1/2-13 7 1722602 1 BACKPLATE, 8 1923114 2 CAPSCREW, Hex Head 1/2-13 x 1, Black 9 1921210 2 CAPSCREW, Hex Head 3/8-16 x 1, Black 10 1721572 1 FRAME ASSEMBLY, Front & Rear
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Frame Group 985881 NOTE: Unless noted otherwise, use the standard hardware torque specification chart. 4 7 1 6 8 5 9 Torque to 150 ft. lbs. 3 (202 Nm) 2 34 33 10 11 14 11 29 12 Torque to 150 ft. lbs. 15 13 16 (202 Nm) 16 17 28 17 18 Torque to 29 55-60 ft. lbs. (74-81 Nm) 36 19 30 35 Service Kit 32 43 23 20 21 1686985 21 38 39 22 31 40 37 43 21 43 41 11 11 42 25 27 21 Torque to 24 22-40 ft. lbs. (30-54 Nm) 26 The above parts group applies to the following Mfg. Nos.: 1694368 - YT1644 1694369
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Frame Group REF NO. PART NO. QTY. DESCRIPTION 40 1725112 1 HUB & ARM ASSEMBLY 41 930671 1 KEY, WOodruff 42 1724264 1 SPINDLE, LH 43 1704314 3 FITTING, Lube Footnotes The above parts group applies to the following Mfg. Nos.: 1694368 - YT1644 1694369 - YT1850 © Copyright 200 3 Simplicity Manufacturing, Inc. All Rights Reserved. 5 TP 400-3821-00-CQ-N
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Steering Group - Manual Steering 986283 NOTE: Unless noted otherwise, use the standard hardware torque specification chart. 2 Steering cap snaps over steering wheel. 1 3 5 4 7 6 15 8 21 9 10 6 20 16 Torque to 36-44 ft. lbs. Use washers 5 or 48-60 Nm 5 as required. 17 11 18 12 19 14 13 Bearing mounts below 15 frame. Slide pinion on steering shaft into gear before tightening nuts. Torque to 36-44 ft. lbs. or 48-60 Nm The above parts group applies to the following Mfg. Nos.: 1694368 - YT16
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Steering Group - Manual Steering REF NO. PART NO. QTY. DESCRIPTION 1 1722318 1 STEERING WHEEL, Straight, Shaft 2 1725024 1 CAP, Steering Wheel, Plain 3 1960540 1 PIN, Spring, 5/16 x 2-1/2 4 1722749 1 COVER, Rubber, Upper Steering Shaft 5 1960114 5 WASHER, 3/4 6 176440 2 BUSHING, 15/32 x 7/8 x 7/8, Nylon 7 928372 2 NUT, Hex KEPS 1/4-20 8 1721736 1 PLATE, Mounting Steering 9 1960518 2 NUT, Push 10 1931317 2 CARRIAGE BOLT, 1/4-20 x 3/4 11 1722385 1 GEAR & SHAFT ASSEMBLY, Steering 12 1960032 1 CAPSC
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Engine & Electric Clutch Group - 16HP Briggs & Stratton, Vanguard 985902 NOTE: Unless noted otherwise, use the standard hardware torque specification chart. 6 3 5 4 Engine manufactures gasket & hardware. Torque to 18 ft. lbs. B&S Vandguard Twin: (25 Nm) 1 2 Tie cables to Left Hand side of shield. 7 30 29 8 31 7 32 9 10 26 27 23 26 22 28 25 23 11 10 Engine Ground Wire 24 Torque to 20 19-23 ft. lbs. 19 (26-31 Nm) 21 11 Position pulley Note: 18 chamfer side up. Orentation 22 of All Keys 12 T
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Engine & Electric Clutch Group - 16HP Briggs & Stratton, Vanguard REF NO. PART NO. QTY. DESCRIPTION 1 1723165 1 HOSE, Oil Drain, 10-1/2" Long, 3/8-18 Fittings 2 * 1 ENGINE, 16HP Briggs & Stratton Vanguard Twin, Model 303777, Type 1114 3 1719847 1 SEAL, Circle 4 1722388 1 BULKHEAD 5 1925003 2 CAPSCREW, Hex Washer Head Taptite, 1/2-20 x 1/2, Black 6 1721950 1 CONTROL, Throttle Double 39" Long w/Knobs 7 1701011 2 TIE, Wire, 7-5/16" Long 8 960112 2 CLAMP, Hose Type E 9 1718678 1 HOSE, Fuel, 59" Lon
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Transmission Group 985888 NOTE: Unless noted otherwise, use the standard hardware torque specification chart. 7 6 4 3 9 2 10 5 8 11 1 12 13 20 14 15 48 19 47 37 17 45 46 21 44 18 16 Torque nut to 22 29 - 34 ft. lbs. (39 - 46 Nm) 43 42 Route through Right 41 Hand slot of back plate. 10 15 Left 40 23 Right 39 15 38 37 24 Right Hand 10 31 13 Side Only. 25 15 13 36 26 32 33 34 27 30 Left Hand 35 17 Spring to be Side 28 29 compressed to Right Hand 2-1/2 inches with Side brake locked. The above
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Transmission Group REF NO. PART NO. QTY. DESCRIPTION 1 1920397 2 NUT, Hex Lock ESNA Light, 1/4-20 2 1960654 2 SCREW, Truss Head, 1/4-20 x 2 3 1722174 1 PAD, Footrest, LH, Differential Lock 4 1722173 1 PAD, Footrest, RH 5 1960636 1 NUT, Hex KEPS, 5/16-18 6 1704351 15 FASTENER, 11/16" Long, Stem Plastic 7 1928352 2 NUT, Hex Flange Whiz Lock, 3/8-16, Large 8 1960637 6 NUT, Hex KEPS, 3/8-16 9 1931350 6 CARRIAGE BOLT, 3/8-16 x 1 10 1919438 6 NUT, Hex Lock ESNA Light, 5/16-18 11 1721728 2 SUPPORT 12
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Transmission Group 985888 NOTE: Unless noted otherwise, use the standard hardware torque specification chart. 7 6 4 3 9 2 10 5 8 11 1 12 13 20 14 15 48 19 47 37 17 45 46 21 44 18 16 Torque nut to 22 29 - 34 ft. lbs. (39 - 46 Nm) 43 42 Route through Right 41 Hand slot of back plate. 10 15 Left 40 23 Right 39 15 38 37 24 Right Hand 10 31 13 Side Only. 25 15 13 36 26 32 33 34 27 30 Left Hand 35 17 Spring to be Side 28 29 compressed to Right Hand 2-1/2 inches with Side brake locked. The above
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Transmission Group REF NO. PART NO. QTY. DESCRIPTION 41 1721392 1 V-BELT 42 1722194 1 PULLEY & HUB ASSEMBLY, Transmission 43 1719968 1 NUT, Hex Flange, M10-1.5, Nylon Insert 44 1719233 1 FAN, 5 Blades, 3 Holes 45 1933958 3 CAPSCREW, Hex Washer Head Taptite, 1/4-20 x 1-1/8 46 1931335 1 CARRIAGE BOLT, 5/16-18 x 1 47 1721593 1 STRAP, 4-1/4 Long 48 1921719 1 CAPSCREW, Hex Head, 5/16-18 x 2-1/2 Footnotes The above parts group applies to the following Mfg. Nos.: 1694368 - YT1644 1694369 - YT1850 © Co
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Transmission SERVICE PARTS - Tuff Torq K-66L 1721952 NOTE: Unless noted otherwise, use the standard hardware torque specification chart. 1 104 2 103 17 102 3 101 4 16 15 100 18 6 5 5 26 14 98 99 97 19 7 93 96 6 10 94 21 20 13 92 8 12 9 91 95 10 11 90 88 89 6 12 87 13 86 74 84 85 26 25 83 24 22 23 82 81 5 80 79 27 31 31 28 29 33 105 45 30 34 46 35 36 47 32 5 48 42 39 55 50 49 76 40 77 51 37 41 52 107 38 53 41 75 54 78 56 44 57 74 59 60 58 61 53 52 51 20 106 63 6 73
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Transmission SERVICE PARTS - Tuff Torq K-66L REF NO. PART NO. QTY. DESCRIPTION 1 1718076 1 RING E15 2 1724314 1 FAN 3 1708651 1 SEAL 4 1708650 1 RING 35 5 1708672 4 RING 15 6 1718083 1 BEARING 6202UC3 7 1724699 1 SHAFT, PUMP 8 1722223 1 PIN 3 x 13.8 9 1724696 1 CAP, M20B 10 1720789 2 O-RING, P18 11 1724692 1 HOUSING, UPPER 12 1724693 2 BUSHING, 25.4 13 1718264 2 SEAL S25.4 x 42 x 8 14 1724695 1 BOLT, 8 x 20 15 1724746 1 FITTING 16 1724745 1 SEAL, 8 17 1724740 1 VALVE, VENT 15 18 1724742 1 TANK,
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Transmission SERVICE PARTS - Tuff Torq K-66L 1721952 NOTE: Unless noted otherwise, use the standard hardware torque specification chart. 1 104 2 103 17 102 3 101 4 16 15 100 18 6 5 5 26 14 98 99 97 19 7 93 96 6 10 94 21 20 13 92 8 12 9 91 95 10 11 90 88 89 6 12 87 13 86 74 84 85 26 25 83 24 22 23 82 81 5 80 79 27 31 31 28 29 33 105 45 30 34 46 35 36 47 32 5 48 42 39 55 50 49 76 40 77 51 37 41 52 107 38 53 41 75 54 78 56 44 57 74 59 60 58 61 53 52 51 20 106 63 6 73
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Transmission SERVICE PARTS - Tuff Torq K-66L REF NO. PART NO. QTY. DESCRIPTION 41 1724715 2 WASHER, 15 x 32 x 3.2 42 1724717 1 PINION, FINAL 44 1724716 1 GEAR, REDUCTION 45 1720761 1 FILTER (25) 46 1724729 1 PUMP, CHARGE 47 1724730 1 SPRING, CHARGE PUMP 48 1724733 1 FORK, PIVOT 49 1724731 1 FORK, DIFF LOCK 50 1724719 1 SHAFT, AXLE RH #1 51 1720860 2 BUSHING 52 1720858 2 THRUST WASHER 53 1720859 2 RING 54 1724720 1 COLLAR, 25.4 55 1724737 8 PIN, DIFF LOCK 56 1724736 1 SLIDER, DIFF LOCK 57 1724738
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Transmission SERVICE PARTS - Tuff Torq K-66L 1721952 NOTE: Unless noted otherwise, use the standard hardware torque specification chart. 1 104 2 103 17 102 3 101 4 16 15 100 18 6 5 5 26 14 98 99 97 19 7 93 96 6 10 94 21 20 13 92 8 12 9 91 95 10 11 90 88 89 6 12 87 13 86 74 84 85 26 25 83 24 22 23 82 81 5 80 79 27 31 31 28 29 33 105 45 30 34 46 35 36 47 32 5 48 42 39 55 50 49 76 40 77 51 37 41 52 107 38 53 41 75 54 78 56 44 57 74 59 60 58 61 53 52 51 20 106 63 6 73
