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71C and 72C Transmission Assembly
Current Production

Ref # Part # Description Qty
10-17-000-(See Note 1) TRANSMISSION ASSEMBLY (MODEL 71C)
10-18-000-(See Note 1) TRANSMISSION ASSEMBLY (MODEL 72C)
1 4775L OUTPUT SHAFT NUT 1
2 4547BA COUPLING (10-17 ONL Y) 1
2A 4547AY COUPLING (10-18 ONLY) 1
3 71-7 BEARING RETAINER (10-17 ONLY) 1
3A 72-7 BEARING RETAINER (10-18 ONLY) 1
4 179859 HEX HEAD BOLT (7/16-14 X 1-1/4) 6
5 103322 LOCKWASHER (7/16) (10-17 ONL Y) 6
6 71C-110 OIL SEAL 1
7 10-00-130-017 BEARING (1 Pkg) 1
7A 10-00-130-018 BEARING (10-17) 1
7B B309AGS BEARING (10-18) 1
8 71-147 BEARING RETAINER GASKET (10-17 ONLY) 1
8A 72-147 BEARING RETAINER GASKET (10-18 ONLY) 1
9 * * ADAPTER 1
9A * * ADAPTER 1
9B * * ADAPTER 1
10 * * LOCK BOLT (7/16-14 X 7/8) 6
11 * * LOCKWASHER (7/16) (10-18 ONLY) 6
11A * * LOCKWASHER (7/16) (10-17 ONLY) 6
12 * * HEX HEAD BOLT (7/16-14 X 1-3/4) 2
13 * * LOCKWASHER (7/16) 2
14 * * ADAPTER GASKET 1
15 * * BEARING 1
16 * * RETAINING RING 1
17 10-17-559-001 DIPSTICK 1
17A 10-13-559-001 DIPSTICK TUBE 1
18 20-01-034-003 DIPSTICK TUBE 1
19 71-79B SHIFT LEVER 1
20 9418892 HEX NUT (5/16-24) 1
21 108579 LOCKWASHER (5/16) 1
22 103340 FLATWASHER (5/16) 1
23 453632 STEEL BALL (5/16) 1
24 71-42 POPPET SPRING 1
25 1004-420052 NEUTRAL SWITCH ASSEMBLY 1
26 1000-640004 NEUTRAL SWITCH (NSS) 1
27 10-00-141-046 O-RING 1
28 10-16-039-001 VALVE COVER 1
29 179796 HEX HEAD BOLT (1/4-20 X 1/2) 3
30 103319 LOCKWASHER (1/4) 3
31 10-16-099-001 SWITCH CAM 1
32 71-14 VALVE COVER GASKET 1
33 71-A244A CONTROL VALVE ASSEMBLY 1
34 4821 SNAP RING 1
35 71-246 SPRING RETAINER 1
36 71-242 VALVE SPRING 1
37 71-243 REGULATOR VALVE 1
38 4804H O-RING 1
39 71-244A CONTROL VALVE 1
40 71C-A60 PUMP ASSEMBLY 1
41 10-00-183-021 HEX HEAD BOLT (5/16-18 X 1-3/8) 4
42 10-00-044-014 OIL SEAL 1
43 3-61 PUMP GASKET 1
44 4873 WOODRUFF KEY 1
45 71C-A8 FORWARD AND REVERSE ADAPTER ASSEMBLY 1
46 20-00-183-017 CAPSCREW (3/8-16 X 1-1/4) 4
47 NO NUMBER FORWARD AND REVERSE ADAPTER (NSS) 1
48 4840D NEEDLE BEARING 1
49 71-144B GASKET 1
50 X1516H PIPE PLUG (1/4) 1
51 71-35 REVERSE CLUTCH PISTON 1
52 4805A CLUTCH SEALING RING 1
53 4804G O-RING 1
54 71-71 REVERSE CLUTCH PRESSURE PLATE 1
55 72-176 STEEL CLUTCH PLATE *0-2
56 72-A66B FRICTION CLUTCH PLATE *1-3
57 71-97 PRESSURE PLATE SPRING 11
58 71-87A DOWEL PIN (.312 DIA X .438 LONG) 3
58A R6-177 DOWEL PIN (.312 DIA X .621 LONG) 3
58B 4622E DOWEL PIN (.312 DIA X .875 LONG) 3
58C 10-00-043-031 DOWEL PIN (.312 DIA X 1.000 LONG) 3
59 71-15B * THRUSTWASHER 1
59A 10-16-193-001 THRUSTWASHER 1
60 4822 SNAP RING 1
61 R6A-7-1/2 SNAP RING (10-17 ONLY) 1
61A 4766B SNAP RING (10-18 ONLY) 1
62 4734 SNAP RING (10-17 ONLY) 1
62A 4559A SNAP RING (10-18 ONLY) 1
63 10-00-130-017 BEARING (10-17 ONLY) 1
63A 10-00-130-016 BEARING (10-18 ONLY) 1
64 71-70 FORWARD CLUTCH CYLINDER (10-17 ONLY) 1
64A 72-70 FORWARD CLUTCH CYLINDER (10-18 ONLY) 1
65 10-16-124-001 FORWARD CLUTCH PISTON 1
65A 71-45 CLUTCH PISTON SUPERSEDED BY 1016-124-001 1
66 5M-122 O-RING 1
67 5L -36 PISTON SEALING RING 1
68 5C-33 CLUTCH SPRING BEARING RING 1
69 3-37 CLUTCH BELLEVILLE SPRING 1
70 4755 SNAP RING 1
71 5C-175A CLUTCH PRESSURE PLATE 1
72 10-16-166-001 STEEL CLUTCH PLATE (10-17 ONLY) 4
72A 10-16-166-001 STEEL CLUTCH PLATE (10-18 ONLY) 6
73 5C-A66A FRICTION CLUTCH PLATE (10-17 ONLY) 5
73A 5C-A66A FRICTION CLUTCH PLATE (10-18 ONLY) 7
74 5L-67 CLUTCH PRESSURE PLATE 1
75 10-00-139-048 SNAP RING (.033-.037 THICK) (10-17 ONLY) (Yellow) 1
75A 10-00-139-049 SNAP RING (.050-.054 THICK) (10-17 ONLY) (Pink) 1
75B 4768 SNAP RING (.050-.054 THICK) (10-18 ONLY) (Green) 1
75C 4768A SNAP RING (.074-.078 THICK) (10-18 ONL Y) (Orange) 1
75D 4768B SNAP RING (.096-.100 THICK) (10-18 ONLY) (White) 1
75E 10-00-139-018 SNAP RING(.062-.066 THICK) (10-18 ONLY) (Purple) 1
76 71-6 RING GEAR (10-17 ONLY) 1
76A 10-16-162-001 RING GEAR (10-18 ONLY) 1
77 71-17 THRUSTWASHER 1
78 4806J SEALING RING 2
79 4495 SNAP RING 1
80 71-40 FORWARD CLUTCH HUB (10-17 ONLY) 1
80A 10-16-179-001 FORWARD CLUTCH HUB (10-18 ONLY) 1
81 218211 WOODRUFF KEY (10-17 ONLY) 1
81A 124553 WOODRUFF KEY (10-18 ONLY) 1
82 71C-3A16 DRIVE GEAR ASSEMBLY (10-17 ONLY) 1
82A 72C-2A16 DRIVE GEAR ASSEMBLY (10-18 ONLY) 1
83 4806B SEALING RING 4
84 71-9C BUSHING 2
85 10-17-659-* * * PINION CARRIER ASSEMBLY (10-17 ONLY) 1
85A 10-18-659-* * * PINION CARRIER ASSEMBLY (10-18 ONLY) 1
86 71-159 THRUSTWASHER (USE W/BUSHING STYLE CASE) 1
86A 10-17-193-001 THRUSTWASHER (USE W/SEALING RING STYLE CASE) 1
87 10-17-036-002 OIL BAFFLE (USED ON 71 C) 1
87A 10-18-036-001 OIL BAFFLE (USED ON 72C) 1
88 10-00-191-002 PLUG (3/8-18) 2
89 4885B DRYSEAL BUSHING (3/4-14) 1
90 5L-222 SPRING, EARLY MODELS, NO LONGER USED 1
91 35-143 FLAT WASHER, EARLY MODELS, NO LONGER USED 1
92 10-00-238-002 OIL INLET SCREEN 1
93 71C-84 OIL RETURN TUBE 1
94 71C-A98 OIL STRAINER ASSEMBL Y 1
95 A4740G BREATHER 1
96 444866 PIPE PLUG (3/8-18) 1
97 444687 PIPE PLUG (1/8-27) 1
98 10-17-565-* * * CASE (10-17 ONLY) 1
98A 10-18-565-* * * CASE (10-18 ONLY) 1
NSS - NOT SERVICED SEPERATELY, BUY NEXT HIGHER ASSEMBLY
Note 1: REFER TO ASSEMBLY NUMBER ON ID TAG (See Figure 1)
*SEE CHART ON PAGE 34 TO DETERMINE PROPER AMOUNT.
**REFER TO REDUCTION SECTION IN BACK OF MANUAL.
*** CHECK MODEL CHART ON VELVET DRIVE PAGE TO DETERMINE CORRECT PART NUMBER
NOTE: The following kits are available for the Model 71 C and 72C transmissionsIndex numbers shown match the index numbers on the Above exploded-view
Ref # Part # Description Qty
A4867AB FORWARD CLUTCH PACK KIT (10-18 ONLY)
71 5C-175A >CLUTCH PRESSURE PLATE 1
72A 10-16-166-001 STEEL CLUTCH PLATE 6
73A 5C-A66A FRICTION CLUTCH PLATE 7
74 5L-67 CLUTCH PRESSURE PLATE 1
Ref # Part # Description Qty
A4867AE FORWARD CLUTCH PACK KIT (10-17 ONLY)
71 5C-175A CLUTCH PRESSURE PLATE 1
72 10-16-166-001 STEEL CLUTCH PLATE 4
73 5C-A66A FRICTION CLUTCH PLATE 5
74 5L-67 CLUTCH PRESSURE PLATE 1
Ref # Part # Description Qty
A4867HA OIL SEAL AND SEALING RING KIT
6 71C-110 OIL SEAL 1
38 4804H O-RING 1
42 1 0-00-044-014 OIL SEAL 1
43 22341 .PUMP GASKET 1
52 4805A CLUTCH SEALING RING 1
53 4804G O-RING 1
66 5M-122 O-RING 1
67 5L-36 CLUTCH SEALING RING 1
78 4806J SEALING RING 2
83 4806B SEALING RING 4
10-00-044-017 OIL SEAL (REDUCTION UNITS ONLY) 1
10-17-410-002 SERVICE GASKET KIT (See Next Kit List) 1
Ref # Part # Description Qty
10-17-41 0-002 SERVICE GASKET KIT
8 71-147 BEARING RETAINER GASKET (10-17 ONLY) 1
8A 72-147 BEARING RETAINER GASKET (10-18 ONLY) 1
14 L4-146 ADAPTER GASKET 1
32 71-14 VALVE COVER GASKET 1
49 71-144B GASKET 1
L4-145 GASKET (REDUCTION UNITS ONLY) 1
L4-147 GASKET (REDUCTION UNITS ONLY) 1
Ref # Part # Description Qty
10-04-420-052 NEUTRAL SWITCH KIT
10-00-539-001 SWITCH AND BODY ASSEMBL Y 1
25 10-00-640-004 ..NEUTRAL SWITCH ASSEMBLY 1
28 10-16-039-001 VALVE COVER 1
29 179796 HEX HEAD BOLT (1/4-20 X 1/2) 3
30 103319 LOCKWASHER (1/4) 3
31 1 0-16-099-001 SWITCH CAM 1
32 71-14 VALVE COVER GASKET 1
1340 INSTRUCTION SHEET 1
Ref # Part # Description Qty
10-95-410-002 SNAP RING SERVICE KIT
15 4766 RETAINING RING 1
34 4821 SNAP RING 1
60 4822 SNAP RING 1
61 R6A-71/2 SNAP RING (10-17 ONLY) 1
61A 47668 SNAP RING (10-18 ONLY) 1
62 4734 SNAP RING (10-17 ONLY) 2
62A 4559A SNAP RING (10-18 ONLY) 1
70 4755 SNAP RING 1
75 10-00-139-048 SNAP RING (.033-.037 THICK)(10-17 ONLY) (Yellow) 1
75A 10-00-139-049 SNAP RING (.050-.054 THICK)(10-17 ONLY) (Pink) 1
758 4768 SNAP RING (050-.054 THICK)(10-18 ONLY) (Green) 2
75C 4768A SNAP RING (.074-.078 THICK)(10-18 ONLY) (Orange) 1
75D 47688 SNAP RING (.096-.100 THICK)(10-18 ONLY) (White) 1
75E 10-00-139-018 SNAP RING (.062-.066 THICK)(10-18 ONLY) (Purple) 1
79 4495 SNAP RING 1
4756D SNAP RING (REDUCTION UNITS ONLY) 1
4756E SNAP RING (REDUCTION UNITS ONLY) 1
4816 SNAP RING (REDUCTION UNITS ONLY) 1
4766A SNAP RING (REDUCTION UNITS ONLY) 1
Reverse Plates use in each model
Steel Plates Friction Plates
1017-001 0 1
1017-002 0 1
1017-003 throuqh 1017-108 use 1 steel and 2 friction plates
1017-202* 1 2
1017-206* 1 2
* The 1017-202 and 1017-206 was originally built with 2 special steel plates and one friction plateVelvet Drive recommends changing this configuration to 1 steel and two frictionIf the steel plates removed are .080" to .084" thick, destroy and discard themThey are no longer used in any Velvet-Drive transmissionOnlyplates measuring .066" to .071" are to be used in any 1017- or 1018-transmission.
Steel Plates Friction Plates
1018-001 1 2
1018-002 1 2
1018-003 through 1018-106 use 2 steel and 3 friction plates.

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