1. Product Introduction
This full line of Midco U 1220 drawworks spare parts is precision manufactured to strict OEM specifications, designed exclusively for the Midco U 1220 heavy-duty drawworks — a core power transmission unit for land-based drilling rigs, workover rigs, and exploration drilling operations. This comprehensive parts portfolio covers every critical assembly of the U 1220 drawworks, including drum clutch air line components, 28-inch element clutch kits, brake roller/auxiliary/main brake assemblies, rotorseal kits, drive shafts, heavy-duty drive chains, drumshaft hardware, bearings, seals, and specialized fasteners. Each part is cross-referenced to original drawing numbers and part numbers (such as 401828 drumshaft, 401786 main brake assembly, 15598 friction lining kits) to guarantee drop-in fitment, zero modification installation, and consistent performance that meets API drilling equipment standards.
2. Core Purpose
Core Purpose: These Midco U 1220 drawworks spare parts are engineered to restore full operational functionality, maintain safety-critical braking and clutch performance, seal fluid systems, stabilize power transmission, and extend the service life of the Midco U 1220 drawworks. They serve dual roles as emergency breakdown repair parts and scheduled preventive maintenance components, providing a standardized procurement and technical reference for rig maintenance teams.
3. Key Functional Specifications
- Clutch System Performance: 28-inch element clutch components (15269 friction show assembly, 15598 friction linings) support a maximum torque rating of 120,000 ft-lbs, with heat resistance up to 320°F for stable clutch engagement.
- Brake System Reliability: Main brake assembly (401786) parts deliver consistent static braking force, with brake blocks (27404) and brake bands (400341) engineered for 2,500+ operating hours of wear resistance.
- Drive Train Durability: Heavy-duty roller chains (RC-200H-3, RC-120-6) meet ANSI B29.1 standards, with tensile strength exceeding 150,000 lbs to handle continuous high-load power transmission.
- Sealing Integrity: Rotorseal (11227) and O-ring (11989) components maintain pressure-tight seals up to 2,800 PSI, preventing hydraulic and lubrication fluid leaks in harsh drilling environments.
4. Structural & Material Features
All Midco U 1220 drawworks spare parts are built with industrial-grade, field-proven materials to withstand rugged drilling conditions: brake components use heat-resistant semi-metallic friction material; drive shafts and fasteners (10045-P capscrews) feature heat-treated alloy steel meeting ASTM A193 standards; bearings (SKF 22244, American CM-240-A) offer high radial load capacity; seals and gaskets use oil-resistant nitrile rubber (NBR) for long-lasting performance; drive chains use hardened carbon steel with anti-wear surface treatment. The modular design aligns perfectly with original drawworks assembly dimensions, ensuring quick on-site replacement and alignment.
5. Applicable Operating Conditions
These spare parts are optimized for extreme land drilling environments, including remote drilling sites, desert terrain with heavy dust exposure, ambient temperatures ranging from -15°F to 140°F, continuous 24/7 operation under high vibration and heavy loads, and exposure to drilling mud, lubricants, and hydraulic fluids. They comply with industry safety and performance standards for onshore drilling rigs, workover operations, and wireline drilling applications.
6. Maintenance & Care Recommendations
- Scheduled Inspections: Inspect clutch air lines, brake rollers, and drive chains every 200 drilling hours; check bearings, seals, and fasteners for wear or looseness every 400 hours.
- Lubrication Protocol: Grease brake rollers, bearings, and drive sprockets with extreme-pressure (EP) lithium grease every 150 hours; keep oil pump and lubrication lines clear of debris to maintain proper flow.
- Wear Replacement Thresholds: Replace clutch friction linings when worn down to 50% of original thickness, brake bands when surface wear exceeds 0.125 inches, and drive chains when elongation reaches 2%.
- Installation Standards: Torque all capscrews and nuts to OEM-specified values (e.g., 5/8” UNC capscrews torqued to 180 ft-lbs); use matching shims and lock washers to prevent loosening from vibration.
- Storage Guidelines: Store seals, gaskets, and friction components in dry, cool conditions to prevent degradation; keep metal parts coated with anti-rust oil to avoid corrosion.
We supply the following spare parts:
| DRAWING NO | PART NO | DESCRIPTION | ||
| 401065 | 10194 | BUSHING 3/4″ x 3/8″ | ||
| 401065 | 24262 | NIPPLE 3/8″ Short | ||
| 401065 | 10236 | ELBOW 3/8″ x 90° | ||
| 401065 | 12029 | ADAPTER 3/8″ x #8 | ||
| 401065 | 16000 | QUICK RELEASE VALVES | ||
| 401065 | 36599 | HOSE ASSEMBLY #8 x 16″ | ||
| 401065 | 15329 | ADAPTER ELBOW 1/2″ x #8 | ||
| 401065 | 10222 | COUPLING3/8″ | ||
| 401065 | 11420 | ADAPTER ELBOW 3/8″ x #8 | ||
| 401065 | 401197 | HOSE ASSEMBLY #8 x 9″ | ||
| 401065 | 10237 | ELBOW 1/2″ | ||
| 401065 | 12077 | NIPPLE 1/2″ x 6″ | ||
| 401065 | 17491 | BUSHING | ||
| 401065 | 12100 | NIPPLE | ||
| 401065 | 10813 | ELBOW – PIPE | ||
| 14608 | 15268 | TUBE WITH VALVE STEM SNAP RINGS | ||
| 14608 | 13840 | AIR CONNECTION TUBE INC. NECESSARY COMPRESSION SLEEVE | ||
| 14608 | 13823 | AIR CONNECTION GASKET | ||
| 14608 | 15271 | TORQUE BAR | ||
| 14608 | 15260 | RELEASE SPRING | ||
| 14608 | 15269 | FRICTION SHOW ASSEMBLY | ||
| 14608 | 15598 | REPLACEMENT FRICTION LINING AND RIVETS (1 SET) | ||
| 401353 | 6155 | ROLLER | ||
| 401353 | 9724 | SPRING | ||
| 401353 | 10045-P | CAPSCREW-HEX HD (5/8″ UNC X 1-1/2″) | ||
| 401353 | 10485 | COTTER PIN (5/32″ X 1-1/4″) | ||
| 401353 | 11106 | PIN | ||
| 401542 | 10133 | NUT | ||
| 401542 | 10134 | NUT | ||
| 401542 | 10187 | LOCK WASHER | ||
| 401542 | 22838 | CAPSCREW | ||
| 401542 | 15193 | LOCK WASHER | ||
| 401542 | 17023 | CAPSCREW | ||
| 401542 | 400625 | CAPSCREW-DRILLED HEAD (7/8” UNC X 2 ¼” LG) | ||
| 401542 | 400705 | KEY | ||
| 401310 | 10036 | CAPSCREW | ||
| 401310 | 10127 | NUT (1/2″) | ||
| 401310 | 10182 | LOCKWASHER (1/2″) | ||
| 401310 | 14898 | BLOCK – PILLOW | ||
| 401538 | 563 | CAPSCREW | ||
| 401538 | 10045 | CAPSCREW | ||
| 401538 | 11046 | CAPSCREW | ||
| 401538 | 10065 | CAPSCREW | ||
| 401538 | 10183 | LOCK WASHER | ||
| 401538 | 10169 | LOCK WASHER | ||
| 401538 | 10183 | LOCK WASHER | ||
| 401538 | 11227 | SEAL – ROTORSEAL | ||
| 401538 | 11989 | SEAL “O”-RING | ||
| 401538 | 15452 | SET SCREW | ||
| 401538 | 15453 | NUT – JAM | ||
| 401538 | 15789 | SEAL | ||
| 401538 | 400760 | SEAL ASSEMBLY – ROTORSEAL | ||
| 401538 | 401067 | ADAPTER | ||
| 401538 | 450647 | HOSE ASSEMBLY | ||
| 401549 | 10134 | HEX NUT | ||
| 401549 | 15193 | LOCK WASHER | ||
| 401549 | 23014 | CAPSCREW – HEX HEAD | ||
| 401549 | 28375 | PIN – TAPER | ||
| 401549 | 28375 | PIN | ||
| 24549 | 24549 | G-20 WIRE LINE TURNBACK ROLLER (COMPLETE ASSY) C/W SHAFT & BEARINGS | ||
| 47752 | 47752 | CLAMP ASSEMBLY – 1-3/8″ | ||
| U-1220 EB | 16073 | LOW DRUM DRIVE – (2-1/2″ P / TRIPLE / EXTRA HEAVY / 88 PITCHES LONG) – RC-200H-3 | ||
| U-1220 EB | 24536 | HIGH DRUM DRIVE – (2-1/2″ P / TRIPLE / EXTRA HEAVY / 74 PITCHES LONG) – RC-200H-3 | ||
| U-1220 EB | LOW AND HIGH DRUM DRIVE CHAINS CONNECTING LINK – 200H-3CL | |||
| U-1220 EB | 10759 | CATSHAFT DRIVE – (2-1/2″ P / SINGLE / 64 PITCHES LONG) – RC-200-1 | ||
| U-1220 EB | CATSHAFT DRIVE CHAIN CONNECTING LINK – 200H-1CL | |||
| U-1220 EB | 14634 | LOW TRANSMISSION – (1-1/2″ P / SEXTUPLE / 78 PITCHES LONG”) – RC-120-6 | ||
| U-1220 EB | 24529 | HIGH TRANSMISSION – (1-1/2″ P / SEXTUPLE / 70 PITCHES LONG) – RC-120-6 | ||
| U-1220 EB | LOW AND HIGH TRANSMISSION CHAINS CONNECTING LINK – 120-6CL | |||
| U-1220 EB | 15577 | ROTARY COUNTERSHAFT DRIVE – (1-3/4″ P / DOUBLE / 88 PITCHES LONG) – RC-140-2 | ||
| U-1220 EB | OIL PUMP LUBE CHAIN – (5/8″ P / SINGLE / 192 PITCHES – RC-50-1 (10 FT LONG) | |||
| U-1220 EB | OIL PUMP LUBE CHAIN CONNECTING LINK – 50-1CL | |||
| 401828 | 10094-P | CAPSCREW (1″ UNC X 3″) | ||
| 401828 | 10186 | LOCKWASHER (1″) | ||
| 401828 | 5015-P | CAPSCREW (LOCKWIRE) | ||
| 401828 | 10044-P | CAPSCREW (5/8″ UNC X 1-1/4″) | ||
| 401828 | 10045-P | CAPSCREW (5/8″ UNC X 1-1/2″) | ||
| 401828 | 401603 | PLATE-PRESSURE | ||
| 401828 | 10183 | LOCKWASHER (5/8″) | ||
| 401828 | 10095 | CAPSCREW (1″ UNC X 3-1/2″) | ||
| 401828 | 10330 | PLUG (1/8″) | ||
| 401828 | 420748 | RING – RETAINER | ||
| 401828 | 420749 | RING – RETAINER | ||
| 401828 | 22807 | PIN – DOWEL | ||
| 401828 | 14527 | BEARING-AMERICAN (CM-240-A) | ||
| 401828 | 16116 | BEARING-AMERICAN (CDA-240-B) | ||
| 401828 | 450508 | GASKET | ||
| 401828 | 14547 | RING – PISTON | ||
| 401828 | 14549 | RING – PISTON | ||
| 401828 | 14551-P | LOCKNUT (1-1/4″ UNC) | ||
| 401828 | 14568 | ELEMENT – CLUTCH | ||
| 401828 | 14740 | CAPSCREW (1/2″ UNC X 1-1/2″SELF LOCKING) | ||
| 401828 | 14838 | SPRING | ||
| 401828 | 15732 | RING – PISTON | ||
| 401828 | 15809-P | CAPSCREW (1-1/4″ UNC X 4-1/2″) | ||
| 401828 | 400195 | GASKET | ||
| 401828 | 400366 | PIN | ||
| 401828 | 400390 | KEY | ||
| 401828 | 400392 | KEY | ||
| 401828 | 400799 | GASKET | ||
| 401828 | 400871 | CAPSCREW – LOCKWIRE | ||
| 401828 | 27267 | NIPPLE – PIPE | ||
| 401828 | 27269 | NIPPLE – PIPE | ||
| 401828 | 27268 | NIPPLE – PIPE | ||
| 401828 | 12615 | ADAPTER – STR | ||
| 401828 | 10336 | PLUG – PIPE | ||
| 401828 | 27264 | COUPLING – PIPE | ||
| 401828 | 10549 | COUPLING – PIPE | ||
| 401828 | 27265 | TEE – PIPE | ||
| 401828 | 15719 | ELBOW – PIPE 90 | ||
| 401828 | 401199 | HOSE ASSY | ||
| 401828 | 450751 | HOSE ASSY | ||
| 401828 | 36105 | CLAMP – PIPE | ||
| 401828 | 27266 | NIPPLE – PIPE | ||
| 401828 | 450752 | HOSE ASSY | ||
| 401828 | 10199 | BUSHING – PIPE | ||
| 401828 | 12269 | ADAPTER – STR | ||
| 401828 | 37952 | HOSE ASSY | ||
| 401827 | 401826 | BRAKE RIM | ||
| 401827 | 14469 | NUT (1″ UNF FLEXLOC) | ||
| 401827 | 400496-P | CAPSCREW | ||
| 401827 | 25048 | CAPSCREW | ||
| 401827 | 10330 | PLUG – PIPE | ||
| 401827 | 11340 | SEAL “O” RING | ||
| 401827 | 401011 | SPACER | ||
| 401827 | 401010 | SPACER | ||
| 401827 | 14548 | RING – PISTON | ||
| 401827 | 14523 | BEARING (SKF 22244) | ||
| 401827 | 40522 | HOSE ASSY | ||
| 401827 | 10129 | NUT | ||
| 401827 | 401206 | CLAMP – PIPE | ||
| 401827 | 401048 | HOSE ASSY | ||
| 401827 | 401199 | HOSE ASSY | ||
| 401827 | 12615 | ADAPTER – STR | ||
| 401827 | 15719 | ELBOW – PIPE | ||
| 401827 | 27264 | COUPLING – PIPE | ||
| 401827 | 27268 | NIPPLE – PIPE | ||
| 401525 | 10063 | CAPSCREW (3/4″NC X 2″) | ||
| 401525 | 10096 | CAPSCREW (1″ UNC X 4″) | ||
| 401525 | 10184 | LOCKWASHER (3/4″) | ||
| 401525 | 401283 | SHIM | ||
| 401525 | 401284 | SHIM | ||
| 401525 | 401285 | SHIM | ||
| 401525 | 401251 | GASKET | ||
| 401837 | 10028 | CAPSCREW (1/2″ UNC X 1-1/4″) | ||
| 401837 | 20454 | CAPSCREW | ||
| 401837 | 10182 | LOCKWASHER (1/2″) | ||
| 401837 | 10918 | BEARING (SKF-22234) | ||
| 401837 | 14525 | BEARING (SKF-23036) | ||
| 401837 | 14526 | BEARING (AMERICAN CD-136) | ||
| 401837 | 14546 | RING – PISTON | ||
| 401837 | 14534 | RING – RETAINING | ||
| 401837 | 16094 | FITTING-GREASE | ||
| 400009 | 11886 | NUT | ||
| 400009 | 14769 | CAPSCREW | ||
| 401837 | 400024 | SPROCKET (26 TOOTH) | ||
| 401837 | 400489 | SPROCKET (64 TOOTH) | ||
| 401837 | 401355 | GASKET | ||
| 401837 | 401360 | KEY (1″ X 1-1/2″ X 6 1/2″) | ||
| 401837 | 401361 | KEY (3/4″ X 1-1/2″ X 4 3/4″) | ||
| 401837 | 401524 | SPROCKET (49 TOOTH) | ||
| 401543 | 401523 | SPROCKET (26 TOOTH) | ||
| 401526 | 10062 | CAPSCREW (3/4″ UNC X 1-3/4″) | ||
| 401526 | 10065-P | CAPSCREW (3/4″ UNC X 2-1/2″) | ||
| 401526 | 10184 | LOCKWASHER (3/4″) | ||
| 401526 | 11886 | FLEXLOC – LOCKNUT (1/2″ UNF) | ||
| 401526 | 14769 | CAPSCREW (1/2″ UNF X 3-1/4″) | ||
| 401526 | 401252 | GASKET | ||
| 401838 | 10029 | CAPSCREW (1/2″ UNC X 1-1/2″) | ||
| 401838 | 10182 | LOCKWASHER (1/2″) | ||
| 401838 | 10918 | BEARING (SKF 22234) | ||
| 401838 | 46125 | KEY (1-1/2″ X 1-1/4″ X 6-1/2″) | ||
| 401838 | 401131 | KEY | ||
| 401528 | 10096 | CAPSCREW (1″ UNC X 4″ LONG) | ||
| 401528 | 10186 | LOCKWASHER (1″) | ||
| 401528 | 610047 | SHIM (1/4″) | ||
| 401528 | 610048 | SHIM (16GA.) | ||
| 401528 | 610049 | SHIM (28GA.) | ||
| 401528 | 610050 | SHIM (0.005″) | ||
| 401838 | 111 | BEARING (SKF-22228) | ||
| 401838 | 10079 | CAPSCREW (7/8″ UNC X 2-1/4″ LONG) | ||
| 401838 | 10186 | LOCKWASHER (1″) | ||
| 401838 | 12284 | LOCKNUT (7/8″ UNC) | ||
| 401838 | 17744 | CAPSCREW (1/2″ UNC X 1-1/2″ LONG) | ||
| 401838 | 400491 | SPROCKET (19 TEETH) | ||
| 401838 | 401013 | SPROCKET (22 TEETH) | ||
| 401838 | 420730 | SPROCKET – OIL PUMP | ||
| 401838 | 610047 | SHIM (1/4″) | ||
| 420726 | 10060 | CAPSCREW | ||
| 420726 | 10066 | CAPSCREW | ||
| 420726 | 10184 | LOCKWASHER (3/4″) | ||
| 420726 | 300068 | GASKET | ||
| 420726 | 401453 | CAPSCREW-SPECIAL | ||
| 420726 | 420635 | ADAPTER | ||
| 401841 | 9369 | KEY (1-1/4″ X 1-1/4″ X 6″) | ||
| 401841 | 10028 | CAPSCREW (1/2″NC X 1-1/4″) | ||
| 401841 | 10182 | LOCKWASHER (1/2″) | ||
| 420727 | 10060 | CAPSCREW | ||
| 420727 | 10066 | CAPSCREW | ||
| 420727 | 10184 | LOCKWASHER (3/4″) | ||
| 420727 | 300068 | GASKET | ||
| 420727 | 401453 | CAPSCREW-SPECIAL | ||
| 420727 | 401251 | GASKET | ||
| 401842 | 9369 | KEY (1-1/4″ X 1-1/4″ X 6″) | ||
| 401842 | 10028 | CAPSCREW (1/2″NC X 1-1/4″) | ||
| 401842 | 10182 | LOCKWASHER (1/2″) | ||
| 401304 | 1805 | CAPSCREW – SPECIAL | ||
| 401304 | 10028 | CAPSCREW | ||
| 401304 | 10182 | LOCK WASHER | ||
| 401304 | 11616 | ADAPTER | ||
| 401304 | 10127 | NUT | ||
| 401304 | 14765 | COUPLING | ||
| 401304 | 401250 | GASKET – HALF | ||
| 401835 | 26 | BEARING (SKF 22222) | ||
| 401835 | 3201 | BEARING (SKF 22224) | ||
| 401835 | 10031 | CAPSCREW | ||
| 401835 | 10040 | CAPSCREW | ||
| 401835 | 10061 | CAPSCREW | ||
| 401835 | 10182 | LOCKWASHER | ||
| 401835 | 10184 | LOCKWASHER | ||
| 401835 | 10960 | BEARING | ||
| 401835 | 11281 | ADAPTER | ||
| 401835 | 12390 | ELBOW – 90 | ||
| 401835 | 12871 | RING – PISTON | ||
| 401835 | 14548 | RING – PISTON | ||
| 401835 | 15073 | CAPSCREW – SELF LOCKING | ||
| 401835 | 15328 | ADAPTER – ELBOW | ||
| 401835 | 15654 | RING – PISTON | ||
| 401835 | 30140 | HOSE ASSEMBLY | ||
| 401835 | 34702 | KEY | ||
| 401835 | 10094 | FITTING – GREASE | ||
| 401835 | 10065 | CAPSCREW – HEX HD | ||
| 401835 | 10184 | WASHER – LOCK HEL | ||
| 401786 | 7980-P | CAPSCREW-HEX DRILLED HD | ||
| 401786 | 25741 | COTTER PIN | ||
| 401786 | 10028-P | CAPSCREW-HEX HD | ||
| 401786 | 10033-P | CAPSCREW-HEX HD | ||
| 401786 | 10045 | CAPSCREW-HEX HD | ||
| 401786 | 10060-P | CAPSCREW-HEX HD | ||
| 401786 | 10064-P | CAPSCREW-HEX HD | ||
| 401786 | 10066-P | CAPSCREW-HEX HD | ||
| 401786 | 10067-P | CAPSCREW-HEX HD | ||
| 401786 | 10069 | CAPSCREW-HEX HD | ||
| 401786 | 10129 | NUT-HEX | ||
| 401786 | 10184 | LOCK WASHER | ||
| 401786 | 16094 | FITTING – HYDRAULIC | ||
| 401786 | 401784 | PIN – BRAKE | ||
| 401786 | 10498 | COTTER PIN | ||
| 401786 | 11895 | PLUG – PIPE | ||
| 401786 | 33150 | KEY | ||
| 401786 | 40419 | KEY | ||
| 401786 | 12256 | BEARING – STRAIGHT ROLLER | ||
| 401786 | 15166 | BEARING | ||
| 401786 | 15167 | BEARING | ||
| 401786 | 17797 | BEARING | ||
| 401786 | 14730 | SPRING | ||
| 401786 | 14795 | BUSHING | ||
| 401786 | 401305 | PIN | ||
| 401786 | 400259 | PIN | ||
| 401786 | 10490 | COTTER PIN | ||
| 401786 | 400330 | PIN | ||
| 401786 | 400405 | PIN | ||
| 401786 | 35925 | BUSHING | ||
| 401786 | 400220 | BOLT – EYE | ||
| 401786 | 400222 | LOCKNUT | ||
| 401786 | 24533 | SCREW – KIT | ||
| 401786 | 10083 | CAPSCREW-HEX, HD | ||
| 401786 | 10130 | NUT-HEX | ||
| 401786 | 27404 | BLOCK – BRAKE | ||
| 401786 | 400341 | BAND – BRAKE | ||
| 401786 | 400291 | PIN | ||
| 401786 | 10175 | FLAT WASHER | ||
| 401786 | 10185 | LOCK WASHER | ||
| 401386 | 10012 | CAPSCREW | ||
| 401386 | 10059 | CAPSCREW 3/4″ UNC x 1″ | ||
| 401386 | 10184 | LOCK WASHER 3/4″ | ||
| 401386 | 10256 | ELBOW | ||
| 401386 | 11708 | CHECK VALVE | ||
| 401386 | 36067 | HOSE ASSY | ||
| 401386 | 15595 | SPRAY NOZZLE | ||
| 401386 | 15797 | SPROCKET | ||
| 401386 | 15829 | ROLLER CHAIN | ||
| 401386 | 16256 | OIL PUMP | ||
| 401386 | 22805 | HEX SETSCREW 1/4″ UNC x 1/2″ | ||
| 401386 | 31035 | HOSE ASSY | ||
| 401386 | 31115 | HOSE ASSY | ||
| 401386 | 35235 | HOSE ASSY | ||
| 401386 | 37954 | HOSE ASSY | ||
| 401386 | 400967 | KEY – STRAIGHT | ||
| 401386 | 450514 | HOSE ASSY | ||
| 40070 | 10028-P | CAPSCREW | ||
| 40070 | 11046 | CAPSCREW | ||
| 40070 | 10127-P | NUT | ||
| 40070 | 10182-P | LOCK WASHER | ||
| 40070 | 10183 | LOCK WASHER | ||
| 40070 | 10573 | FITTING – ALEMITE | ||
| 40070 | 11227 | SEAL – ROTORSEAL | ||
| 40070 | 11989 | SEAL “O”-RING | ||
| 40070 | 15212 | RING – RETAINING | ||
| 40070 | 15213 | RING – RETAINING | ||
| 40070 | 15215 | BEARING – BALL | ||
| 40070 | 15216 | BEARING – BALL | ||
| 40070 | 15218 | RING – RETAINING | ||
| 15 | 40070 | 15219 | SEAL | |
| 16 | 40070 | 15220 | SEAL | |
| 17 | 40070 | 400757 | RING – RUB | |
| 18 | 40070 | 400758 | RING – RUB | |
| 19 | 40070 | 400762 | SPACER | |
| 20 | 40070 | 400772 | SPACER | |
| 1 | 401752 | 4626 | GASKET | |
| 2 | 401752 | 400406 | GASKET | |
| 3 | 401752 | 400409 | GASKET | |
| 4 | 401752 | 400410 | GASKET | |
| 5 | 401752 | 400414 | GASKET | |
| 6 | 401752 | 400498 | GASKET | |
| 7 | 401752 | 400642 | GASKET | |
| 8 | 401752 | 401224 | GASKET | |
| 9 | 401752 | 420306 | GASKET | |
| 10 | 401752 | 450744 | GASKET | |
| 11 | 401752 | 5917 | GASKET | |
| 12 | 401752 | 10012 | CAPSCREW | |
| 13 | 401752 | 10027 | CAPSCREW | |
| 14 | 401752 | 10043 | CAPSCREW | |
| 15 | 401752 | 10044 | CAPSCREW (5/8″ UNC X 1-1/4″) | |
| 16 | 401752 | 10046 | CAPSCREW | |
| 17 | 401752 | 10128 | NUT | |
| 18 | 401752 | 10180 | LOCKWASHER | |
| 19 | 401752 | 10182 | LOCKWASHER (1/2″) | |
| 20 | 401752 | 10183 | LOCKWASHER (5/8″) | |
| 22 | 401752 | 10002 | CAPSCREW | |
| 23 | 401752 | 19048 | SEAL | |
| 24 | 401752 | 401227 | GASKET | |
Field Fault Repair Cases
Case 1: Drum Clutch Air Line Failure
A drilling rig experienced intermittent clutch engagement due to cracked air line hoses and leaking quick release valves in the drum clutch assembly. Replacing worn 36599 hose assemblies and 16000 quick release valves restored consistent air pressure, resolving clutch slippage and restoring full drawworks functionality.
Case 2: Main Brake Roller Seizure
During a tripping operation, the main brake system failed to disengage smoothly, caused by seized brake rollers (6155) and broken brake springs (9724). Installing new brake rollers, replacement springs, and lubricating associated pins eliminated binding, ensuring smooth brake actuation and safe load control.
Case 3: Drive Shaft Bearing Failure
Excessive vibration and noise emanated from the drumshaft assembly, traced to failed SKF 22244 bearings and worn piston rings. Replacing the faulty bearings and 14548 piston rings, plus re-torquing all associated capscrews, eliminated vibration and restored smooth shaft rotation.
Frequently Asked Questions (FAQ)
| Question | Answer |
| Are these parts 100% compatible with the original Midco U 1220 drawworks? | Yes, every part is manufactured to match OEM drawing numbers, part numbers, and dimensional specifications for the Midco U 1220 drawworks, ensuring direct drop-in replacement with no modifications needed. |
| What is the typical service life of the clutch friction linings (15598)? | Under normal drilling use and proper maintenance, the 15598 replacement friction lining set lasts 2,000–2,800 operating hours before replacement is recommended. |
| Do you provide torque specifications for installing these drawworks parts? | Yes, we include OEM-standard torque values for all capscrews, nuts, and fasteners with every parts shipment, ensuring proper installation and preventing vibration-related failures. |
Closing Section
This complete catalog of Midco U 1220 drawworks spare parts serves as your official procurement and technical reference standard for maintaining, repairing, and overhauling your Midco U 1220 drawworks. Each component is labeled with its unique OEM part number, drawing number, and assembly designation to eliminate ordering errors and guarantee compatibility with your rig’s drawworks unit. Whether you need to replace worn clutch components, repair faulty brake systems, replace failed shaft bearings, fix leaking rotorseals, or refresh worn drive chains, these high-quality, durable parts deliver reliable performance to minimize rig downtime and uphold drilling safety standards.
