| Item | Part No. | Part Name | Qty | Serial No. |
| 1 | 177-40-11110 | HOUSING | 12128- | |
| 2 | 07043-50415 | PLUG | 12128- | |
| 3 | 07042-30108 | PLUG | 12128- | |
| 4 | 175-43-12140 | COVER | 12128- | |
| 4A | 175-892-5490 | COVER | 12128- | |
| 5 | 175-43-12151 | GASKET | 23980- | |
| 5 | \0\175-43-12150 | GASKET | 12128-23979 | |
| 6 | 01010-51025 | BOLT | 12128- | |
| 6A | 01010-51030 | BOLT | 12128- | |
| 7 | 01602-21030 | WASHER | 12128- | |
| 8 | 177-40-11211 | SPOOL,L.H. | 12128- | |
| 9 | 177-40-11191 | SPOOL,R.H. | 12128- | |
| 10 | 175-40-11140 | SPRING | 12128- | |
| 11 | 175-40-11150 | VALVE | 12128- | |
| 12 | 175-40-11160 | SLEEVE | 12128- | |
| 13 | 04065-01610 | RING | 12128- | |
| 14 | 175-43-12180 | BUSHING | 12128- | |
| 15 | 195-40-11120 | SPRING | 12128- | |
| 16 | 177-40-11180 | WASHER | 12128- | |
| 17 | 177-40-11170 | RING | 12128- | |
| 18 | 175-40-11330 | PLATE | 12128- | |
| 19 | 01010-51030 | BOLT | 12128- | |
| 20 | 01602-21030 | WASHER | 12128- | |
| 21 | 170-33-13530 | STOPPER | 12128- | |
| 22 | 07000-03025 | O-RING | 12128- | |
| 23 | 04065-03515 | RING | 12128- | |
| 25 | 04010-00519 | KEY | 12128- | |
| 28 | 177-40-11120 | SHAFT,R.H. | 12128- | |
| 29 | 177-40-11131 | SHAFT,L.H. | 12128- | |
| 30 | 04010-00522 | KEY | 12128- | |
| 31 | 170-43-12360 | BUSHING | 12128- | |
| 32 | 175-892-7260 | PACKING | 12128- | |
| 33 | 177-40-11140 | SEAL | 12128- | |
| 34 | 170-43-12380 | COLLAR | 12128- | |
| 35 | 01302-20812 | SCREW | 12128- | |
| 36 | 04059-01012 | WIRE | 12128- | |
| 37 | 175-43-12240 | COLLAR | 12128- | |
| 38 | 170-43-12321 | LEVER | 12128- | |
| 39 | 01010-51250 | BOLT | 12128- | |
| 40 | 01602-21236 | WASHER | 12128- | |
| 41 | 170-43-12330 | ROLLER | 12128- | |
| 42 | 04205-11238 | PIN | 12128- | |
| 43 | 01641-21223 | WASHER | 12128- | |
| 44 | 04050-13020 | PIN | 12128- | |
| 45 | 170-43-12120 | TUBE | 12128- | |
| 46 | 175-43-12120 | TUBE | 12128- | |
| 47 | 07000-03028 | O-RING | 12128- | |
| 48 | 07000-02014 | O-RING | 12128- | |
| 49 | 175-40-21122 | SEAT | 12128- | |
| 50 | 175-40-22591 | GASKET | 23980- | |
| 50 | \0\175-40-22521 | GASKET | 12128-23979 | |
| 51 | 07000-03040 | O-RING | 12128- | |
| 52 | 01011-51200 | BOLT | 12128- | |
| 53 | 01602-21236 | WASHER | 12128- | |
| 54 | 07000-03028 | O-RING | 12128- | |
| 154-40-00040 | TUBE ASS'Y | 12128- | ||
| 55 | \6\ | TUBE | 12128- | |
| 56 | 07042-30108 | PLUG | 12128- | |
| 57 | 07000-03028 | O-RING | 12128- | |
| 58 | 01010-51030 | BOLT | 12128- | |
| 59 | 01602-21030 | WASHER | 12128- | |
| 175-40-00032 | RELIEF VALVE ASS'Y | 23891- | ||
| \0\175-40-00030 | RELIEF VALVE ASS'Y | 12128-23890 | ||
| 154-40-00030 | HOUSING ASS'Y | 12128- | ||
| 60 | \6\ | HOUSING | 12128- | |
| 61 | 07042-30108 | PLUG | 12128- | |
| 61A | 07043-00108 | PLUG | 12128- | |
| 62 | 145-14-23710 | VALVE | 12128- | |
| 63 | 145-14-23720 | PISTON | 12128- | |
| 64 | 175-40-11171 | SPRING | 12128- | |
| 65 | 155-40-11290 | PISTON | 23891- | |
| 65 | \0\175-43-12354 | PISTON | 12128-23890 | |
| 65A | 07000-03025 | O-RING | 12128- | |
| 65B | 170-33-13530 | STOPPER | 12128- | |
| 65C | 04065-03515 | RING | 12128- | |
| 66 | 01010-51275 | BOLT | 12128- | |
| 67 | 01602-21236 | WASHER | 12128- | |
| 68 | 01011-51230 | BOLT | 12128- | |
| 69 | 01602-21236 | WASHER | 12128- | |
| 70 | 01011-51255 | BOLT | 12128- | |
| 71 | 01602-21236 | WASHER | 12128- | |
| 72 | 01010-51260 | BOLT | 12128- | |
| 72A | 01010-51285 | BOLT | 12128- | |
| 73 | 01602-21236 | WASHER | 12128- | |
| 74 | 195-33-11220 | SPACER | 12128- | |
| 74A | 175-40-22540 | SPACER | 12128- | |
| 75 | 175-40-21130 | TUBE | 12128- | |
| 76 | 07000-03022 | O-RING (KIT) | 12128- | |
| 77 | 175-40-22460 | CLAMP | 12128- | |
| 78 | 01012-51025 | BOLT | 12128- | |
| 79 | 01590-11012 | NUT | 12128- | |
| 80 | 04050-12018 | PIN | 12128- |