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MTD Gear Case Parts for NEWER models  (scroll down for older models)
Reference # in
diagram
Replaces MTD #
Order
 
    684-0158, 984-0158 Impeller
 
684-04057, 68404057A
684-0637, 6840637A
684-04057A-0637
1
    618-0124, 618-0124A     Housing
    LH
    918-0124, 918-0124A    includes
    bushing
    618-0058, 918-0058      and oil
    seal
    719-0320, 919-0320
    719-04292, 919-04292
    618-0418, 918-0418
2
    618-0123      Housing RH
    618-0123A    includes bushing
    618-0059      and oil seal
    719-0319
    719-04291
3
    710-0642, 910-0642  
    Bolts
5
    714-0161, 914-0161      
    Key
6
    715-0143, 915-0143
    Pin with hollow center
 
    715-04021, 915-04021
    Pin with hard center
7
    717-04449, 917-04449
    717-0528, 717-0528A
    917-0528, 917-0528A
    717-04861, 917-04861
    Brass Worm Gear
8
    717-0526, 917-0526
    Worm Shaft with splined end
 
    717-04126, 917-04126   
    Worm Shaft with flat end
 
    717-3320, 917-3320
    Worm Shaft for Tractor
    Mounted Snowblowers
9
    718-04071    
    Thrust Collar
         OD: 1 1/2"  ID: 3/4"
Height: 5/8"
 
    718-0186     
    Thrust Collar
     OD: 1 1/2"  
          ID: 3/4"  Height: 7/16"
10
    721-0325      Plug
11
    721-0327      Oil Seal
12
    736-0351      Washer
13
    736-0369      Washer
14
    736-0445      Washer
 
    736-3084      Washer
15
    741-0662      Bushing
    Width: 0.50"
         Inner Dimension: 0.75"
Outer Dimension: 1.00"
16
    741-0663      Bushing
    Width: .925"
         Inner Dimension: .50"
Outer Dimension: .75"
17
    741-0661      Bushing
18
    721-0179, 921-0338      Oil Seal
 
    721-0327      Oil Seal
 
    721-0338      Oil Seal
837-0168, 727-0111, 727-0149,
737-0122
737-0124, 737-0129 737-0157,
737-0168
737-0168A
Grease
     

MTD Gear Case Parts for OLDER models  (scroll up for newer models)
Reference # in
diagram
Replaces MTD #
Order
 
715-0249, 915-0249, 489401
Roll Pin
35
715-0118 Roll Pin
37
717-0297   Left Case Half
753-0889

(now comes as a kit, both halves)
46
741-0192   bushing
50
710-0891   shear bolt
51
721-0146   oil seal
53
741-0182   bushing
54
736-0266   washer
55
717-0300  Aluminium worm gear
971-0300
717-1425
917-1425
  717-1425 Brass worm gear
917-1425
56
741-0184   thrust bearing
57
736-0291   washer
58
717-0299   worm gear
59
741-0217   bushing
60
717-0298   Right Hand Case Half

(now comes as a kit, both halves)
61
710-0376   bolt
710-3008
62
721-0144   gasket
63
721-0145   oil seal
64
714-0126   woodruff key
65
716-0111 snap ring
66
714-0135   woodruff key
77
736-0291   washer
837-0168, 727-0111, 727-0149,
737-0122
737-0124, 737-0129 737-0157,
737-0168
737-0168A
Grease
 
 
  
918-04190, 918-04190A,
918-04190B, 618-04170,
618-04170A
22" Gearbox
  
618-04294, 618-04294A,
618-04294B
918-04294, 918-04294A,
918-04294B
Gearbox Assembly