Product Overview
This comprehensive collection of Midco U1220 replacement parts encompasses every critical wear item, structural component, and hydraulic/pneumatic fitting required for full rig maintenance and repair. All parts are manufactured to ISO 9001 quality standards, using premium-grade alloy steel, heat-treated metals, and industrial-grade elastomers to withstand extreme torque, pressure, and abrasive drilling conditions. Each component is cross-referenced to original factory part numbers, drawing numbers, and assembly specifications for 100% fitment assurance, with over 150 unique part numbers covering drum clutches, brake assemblies, drive shafts, rotorseals, chain drives, and auxiliary hardware.
Functional Specifications
Every Midco U1220 replacement part is engineered to deliver consistent, factory-rated performance: pneumatic clutch components maintain 120-150 PSI operating pressure for seamless engagement/disengagement; brake hardware delivers reliable friction clamping with 20,000+ cycle durability; shaft and bearing components handle up to 50,000 ft-lbs of rotational torque; chain and sprocket parts ensure synchronous power transfer with zero slippage; and seal/elastomer components provide leak-proof performance in temperatures ranging from -20°F to 220°F. These parts support full rig functionality, including drum clutch actuation, brake modulation, power transmission, rotational sealing, and lubrication system operation.
Structural & Engineering Features
- Precision Machining: Tight tolerance machining (±0.001 inches) guarantees direct bolt-on installation, no modification required for all U1220 assemblies
- Heavy-Duty Material Construction: Heat-treated alloy steel for load-bearing components, nitrile rubber seals for chemical resistance, and forged fittings for pressure retention
- Modular Assembly Design: Parts are grouped by rig assembly (drum clutch, brake roller, driveshaft, etc.) for streamlined inventory management and targeted repairs
- Wear-Resistant Coatings: Select components feature corrosion-resistant plating and friction-reducing finishes to minimize wear in harsh field conditions
- OEM Matching Dimensions: All parts align with original Midco drawing numbers and assembly layouts, ensuring compatibility with existing U1220 rig frameworks
Applicable Operating Conditions
These Midco U1220 parts are built for heavy-duty onshore drilling environments, including oilfield drilling, water well drilling, geothermal drilling, and construction drilling operations. They perform reliably in high-dust, high-moisture, high-vibration, and extreme temperature settings, making them suitable for remote drilling sites, industrial work zones, and high-utilization rig fleets. Components are rated for continuous heavy-duty operation, withstanding the repetitive stress and load demands of 24/7 drilling rig use.
Maintenance & Service Recommendations
- Conduct visual inspections of wear components (bushings, seals, friction linings) every 250 operating hours to identify early wear signs
- Lubricate fittings, bearings, and moving parts with industrial-grade drilling rig lubricant per OEM specifications to prevent friction failure
- Replace torque-critical fasteners, springs, and seals preventatively every 1,000 operating hours to avoid catastrophic failure
- Store replacement parts in a dry, temperature-controlled environment to preserve elastomer integrity and prevent metal corrosion
- Verify part number cross-references prior to installation to ensure correct fitment for specific U1220 sub-assemblies
- We supply the following spare parts:
| ASSEMBLY | ITEM NO | DRAWING NO | PART NO | DESCRIPTION |
| Drum Clutch Air Line Assy | 1 | 401065 | 10194 | BUSHING 3/4″ x 3/8″ |
| Drum Clutch Air Line Assy | 2 | 401065 | 24262 | NIPPLE 3/8″ Short |
| Drum Clutch Air Line Assy | 3 | 401065 | 10236 | ELBOW 3/8″ x 90° |
| Drum Clutch Air Line Assy | 4 | 401065 | 12029 | ADAPTER 3/8″ x #8 |
| Drum Clutch Air Line Assy | 5 | 401065 | 16000 | QUICK RELEASE VALVES |
| Drum Clutch Air Line Assy | 6 | 401065 | 36599 | HOSE ASSEMBLY #8 x 16″ |
| Drum Clutch Air Line Assy | 7 | 401065 | 15329 | ADAPTER ELBOW 1/2″ x #8 |
| Drum Clutch Air Line Assy | 8 | 401065 | 10222 | COUPLING3/8″ |
| Drum Clutch Air Line Assy | 9 | 401065 | 11420 | ADAPTER ELBOW 3/8″ x #8 |
| Drum Clutch Air Line Assy | 10 | 401065 | 401197 | HOSE ASSEMBLY #8 x 9″ |
| Drum Clutch Air Line Assy | 11 | 401065 | 10237 | ELBOW 1/2″ |
| Drum Clutch Air Line Assy | 12 | 401065 | 12077 | NIPPLE 1/2″ x 6″ |
| Drum Clutch Air Line Assy | 13 | 401065 | 17491 | BUSHING |
| Drum Clutch Air Line Assy | 14 | 401065 | 12100 | NIPPLE |
| Drum Clutch Air Line Assy | 15 | 401065 | 10813 | ELBOW – PIPE |
| 28″ Element Clutch | 1 | 14608 | 15268 | TUBE WITH VALVE STEM SNAP RINGS |
| 28″ Element Clutch | 2 | 14608 | 13840 | AIR CONNECTION TUBE INC. NECESSARY COMPRESSION SLEEVE |
| 28″ Element Clutch | 3 | 14608 | 13823 | AIR CONNECTION GASKET |
| 28″ Element Clutch | 4 | 14608 | 15271 | TORQUE BAR |
| 28″ Element Clutch | 5 | 14608 | 15260 | RELEASE SPRING |
| 28″ Element Clutch | 6 | 14608 | 15269 | FRICTION SHOW ASSEMBLY |
| 28″ Element Clutch | 7 | 14608 | 15598 | REPLACEMENT FRICTION LINING AND RIVETS (1 SET) |
| Brake Roller Assy | 1 | 401353 | 6155 | ROLLER |
| Brake Roller Assy | 2 | 401353 | 9724 | SPRING |
| Brake Roller Assy | 3 | 401353 | 10045-P | CAPSCREW-HEX HD (5/8″ UNC X 1-1/2″) |
| Brake Roller Assy | 4 | 401353 | 10485 | COTTER PIN (5/32″ X 1-1/4″) |
| Brake Roller Assy | 5 | 401353 | 11106 | PIN |
| Brake Assy Aux | 1 | 401542 | 10133 | NUT |
| Brake Assy Aux | 2 | 401542 | 10134 | NUT |
| Brake Assy Aux | 3 | 401542 | 10187 | LOCK WASHER |
| Brake Assy Aux | 4 | 401542 | 22838 | CAPSCREW |
| Brake Assy Aux | 5 | 401542 | 15193 | LOCK WASHER |
| Brake Assy Aux | 6 | 401542 | 17023 | CAPSCREW |
| Brake Assy Aux | 8 | 401542 | 400625 | CAPSCREW-DRILLED HEAD (7/8” UNC X 2 ¼” LG) |
| Brake Assy Aux | 9 | 401542 | 400705 | KEY |
| Brake Shifter | 1 | 401310 | 10036 | CAPSCREW |
| Brake Shifter | 2 | 401310 | 10127 | NUT (1/2″) |
| Brake Shifter | 3 | 401310 | 10182 | LOCKWASHER (1/2″) |
| Brake Shifter | 4 | 401310 | 14898 | BLOCK – PILLOW |
| ODS Rotorseal Assy | 1 | 401538 | 563 | CAPSCREW |
| ODS Rotorseal Assy | 2 | 401538 | 10045 | CAPSCREW |
| ODS Rotorseal Assy | 3 | 401538 | 11046 | CAPSCREW |
| ODS Rotorseal Assy | 4 | 401538 | 10065 | CAPSCREW |
| ODS Rotorseal Assy | 5 | 401538 | 10183 | LOCK WASHER |
| ODS Rotorseal Assy | 6 | 401538 | 10169 | LOCK WASHER |
| ODS Rotorseal Assy | 7 | 401538 | 10183 | LOCK WASHER |
| ODS Rotorseal Assy | 8 | 401538 | 11227 | SEAL – ROTORSEAL |
| ODS Rotorseal Assy | 9 | 401538 | 11989 | SEAL “O”-RING |
| ODS Rotorseal Assy | 10 | 401538 | 15452 | SET SCREW |
| ODS Rotorseal Assy | 11 | 401538 | 15453 | NUT – JAM |
| ODS Rotorseal Assy | 12 | 401538 | 15789 | SEAL |
| ODS Rotorseal Assy | 13 | 401538 | 400760 | SEAL ASSEMBLY – ROTORSEAL |
| ODS Rotorseal Assy | 14 | 401538 | 401067 | ADAPTER |
| ODS Rotorseal Assy | 15 | 401538 | 450647 | HOSE ASSEMBLY |
| Wireline Turnback Assy | 1 | 24549 | 24549 | G-20 WIRE LINE TURNBACK ROLLER (COMPLETE ASSY) C/W SHAFT & BEARINGS |
| Clamp Assembly | 1 | 47752 | 47752 | CLAMP ASSEMBLY – 1-3/8″ |
| Chains | 3 | U-1220 EB | LOW AND HIGH DRUM DRIVE CHAINS CONNECTING LINK – 200H-3CL | |
| Chains | 5 | U-1220 EB | CATSHAFT DRIVE CHAIN CONNECTING LINK – 200H-1CL | |
| Chains | 8 | U-1220 EB | LOW AND HIGH TRANSMISSION CHAINS CONNECTING LINK – 120-6CL | |
| Chains | 10 | U-1220 EB | OIL PUMP LUBE CHAIN – (5/8″ P / SINGLE / 192 PITCHES – RC-50-1 (10 FT LONG) | |
| Chains | 11 | U-1220 EB | OIL PUMP LUBE CHAIN CONNECTING LINK – 50-1CL | |
| Drumshaft | 1 | 401828 | 10094-P | CAPSCREW (1″ UNC X 3″) |
| Drumshaft | 2 | 401828 | 10186 | LOCKWASHER (1″) |
| Drumshaft | 3 | 401828 | 5015-P | CAPSCREW (LOCKWIRE) |
| Drumshaft | 4 | 401828 | 10044-P | CAPSCREW (5/8″ UNC X 1-1/4″) |
| Drumshaft | 5 | 401828 | 10045-P | CAPSCREW (5/8″ UNC X 1-1/2″) |
| Drumshaft | 6 | 401828 | 401603 | PLATE-PRESSURE |
| Drumshaft | 7 | 401828 | 10183 | LOCKWASHER (5/8″) |
| Drumshaft | 8 | 401828 | 10095 | CAPSCREW (1″ UNC X 3-1/2″) |
| Drumshaft | 9 | 401828 | 10330 | PLUG (1/8″) |
| Drumshaft | 10 | 401828 | 420748 | RING – RETAINER |
| Drumshaft | 11 | 401828 | 12333 | NUT (1″ UNC FLEXLOC) |
| Drumshaft | 12 | 401828 | 420749 | RING – RETAINER |
| Drumshaft | 13 | 401828 | 22807 | PIN – DOWEL |
| Drumshaft | 14 | 401828 | 14527 | BEARING-AMERICAN (CM-240-A) |
| Drumshaft | 15 | 401828 | 16116 | BEARING-AMERICAN (CDA-240-B) |
| Drumshaft | 16 | 401828 | 450508 | GASKET |
| Drumshaft | 17 | 401828 | 14547 | RING – PISTON |
| Drumshaft | 19 | 401828 | 14549 | RING – PISTON |
| Drumshaft | 20 | 401828 | 14551-P | LOCKNUT (1-1/4″ UNC) |
| Drumshaft | 21 | 401828 | 14568 | ELEMENT – CLUTCH |
| Drumshaft | 22 | 401828 | 14740 | CAPSCREW (1/2″ UNC X 1-1/2″SELF LOCKING) |
| Drumshaft | 23 | 401828 | 14813 | PIN – ROLL (1/4″ X 3) |
| Drumshaft | 24 | 401828 | 14838 | SPRING |
| Drumshaft | 25 | 401828 | 15732 | RING – PISTON |
| Drumshaft | 26 | 401828 | 15809-P | CAPSCREW (1-1/4″ UNC X 4-1/2″) |
| Drumshaft | 33 | 401828 | 400195 | GASKET |
| Drumshaft | 34 | 401828 | 400366 | PIN |
| Drumshaft | 35 | 401828 | 400390 | KEY |
| Drumshaft | 37 | 401828 | 400392 | KEY |
| Drumshaft | 38 | 401828 | 400799 | GASKET |
| Drumshaft | 39 | 401828 | 400871 | CAPSCREW – LOCKWIRE |
| Drumshaft | 40 | 401828 | 27267 | NIPPLE – PIPE |
| Drumshaft | 41 | 401828 | 27269 | NIPPLE – PIPE |
| Drumshaft | 42 | 401828 | 27268 | NIPPLE – PIPE |
| Drumshaft | 43 | 401828 | 12615 | ADAPTER – STR |
| Drumshaft | 44 | 401828 | 10336 | PLUG – PIPE |
| Drumshaft | 45 | 401828 | 27264 | COUPLING – PIPE |
| Drumshaft | 46 | 401828 | 10549 | COUPLING – PIPE |
| Drumshaft | 47 | 401828 | 27265 | TEE – PIPE |
| Drumshaft | 48 | 401828 | 15719 | ELBOW – PIPE 90 |
| Drumshaft | 49 | 401828 | 401199 | HOSE ASSY |
| Drumshaft | 50 | 401828 | 450751 | HOSE ASSY |
| Drumshaft | 51 | 401828 | 36105 | CLAMP – PIPE |
| Drumshaft | 52 | 401828 | 27266 | NIPPLE – PIPE |
| Drumshaft | 53 | 401828 | 450752 | HOSE ASSY |
| Drumshaft | 54 | 401828 | 10199 | BUSHING – PIPE |
| Drumshaft | 55 | 401828 | 12269 | ADAPTER – STR |
| Drumshaft | 56 | 401828 | 37952 | HOSE ASSY |
| Drumshaft | 57 | 401827 | 401826 | BRAKE RIM |
| Drumshaft | 58 | 401827 | 14469 | NUT (1″ UNF FLEXLOC) |
| Drumshaft | 59 | 401827 | 400496-P | CAPSCREW |
| Drumshaft | 60 | 401827 | 25048 | CAPSCREW |
| Drumshaft | 61 | 401827 | 10330 | PLUG – PIPE |
| Drumshaft | 62 | 401827 | 11340 | SEAL “O” RING |
| Drumshaft | 63 | 401827 | 401011 | SPACER |
| Drumshaft | 64 | 401827 | 401010 | SPACER |
| Drumshaft | 65 | 401827 | 14548 | RING – PISTON |
| Drumshaft | 66 | 401827 | 14523 | BEARING (SKF 22244) |
| Drumshaft | 68 | 401827 | 40522 | HOSE ASSY |
| Drumshaft | 72 | 401827 | 10129 | NUT |
| Drumshaft | 73 | 401827 | 401206 | CLAMP – PIPE |
| Drumshaft | 74 | 401827 | 401048 | HOSE ASSY |
| Drumshaft | 75 | 401827 | 401199 | HOSE ASSY |
| Drumshaft | 76 | 401827 | 12615 | ADAPTER – STR |
| Drumshaft | 77 | 401827 | 15719 | ELBOW – PIPE |
| Drumshaft | 78 | 401827 | 27264 | COUPLING – PIPE |
| Drumshaft | 79 | 401827 | 27268 | NIPPLE – PIPE |
| Jackshaft | 1 | 401525 | 10063 | CAPSCREW (3/4″NC X 2″) |
| Jackshaft | 2 | 401525 | 10096 | CAPSCREW (1″ UNC X 4″) |
| Jackshaft | 3 | 401525 | 10184 | LOCKWASHER (3/4″) |
| Jackshaft | 4 | 401525 | 12333 | NUT – FLEXLOC (1″ UNC) |
| Jackshaft | 5 | 401525 | 401283 | SHIM |
| Jackshaft | 6 | 401525 | 401284 | SHIM |
| Jackshaft | 7 | 401525 | 401285 | SHIM |
| Jackshaft | 8 | 401525 | 401251 | GASKET |
| Jackshaft | 9 | 401837 | 10028 | CAPSCREW (1/2″ UNC X 1-1/4″) |
| Jackshaft | 10 | 401837 | 20454 | CAPSCREW |
| Jackshaft | 11 | 401837 | 10182 | LOCKWASHER (1/2″) |
| Jackshaft | 12 | 401837 | 10918 | BEARING (SKF-22234) |
| Jackshaft | 13 | 401837 | 14525 | BEARING (SKF-23036) |
| Jackshaft | 14 | 401837 | 14526 | BEARING (AMERICAN CD-136) |
| Jackshaft | 15 | 401837 | 14546 | RING – PISTON |
| Jackshaft | 16 | 401837 | 14534 | RING – RETAINING |
| Jackshaft | 17 | 401837 | 16094 | FITTING-GREASE |
| Jackshaft | 18 | 400009 | 11886 | NUT |
| Jackshaft | 19 | 400009 | 14769 | CAPSCREW |
| Jackshaft | 21 | 401837 | 400024 | SPROCKET (26 TOOTH) |
| Jackshaft | 23 | 401837 | 400489 | SPROCKET (64 TOOTH) |
| Jackshaft | 29 | 401837 | 401355 | GASKET |
| Jackshaft | 32 | 401837 | 401360 | KEY (1″ X 1-1/2″ X 6 1/2″) |
| Jackshaft | 33 | 401837 | 401361 | KEY (3/4″ X 1-1/2″ X 4 3/4″) |
| Jackshaft | 36 | 401837 | 401524 | SPROCKET (49 TOOTH) |
| Jackshaft | 37 | 401837 | 12333 | NUT – FLEXLOC (1″NC) |
| Jackshaft | 38 | 401543 | 401523 | SPROCKET (26 TOOTH) |
| Low Drive Shaft | 1 | 401526 | 10062 | CAPSCREW (3/4″ UNC X 1-3/4″) |
| Low Drive Shaft | 2 | 401526 | 10065-P | CAPSCREW (3/4″ UNC X 2-1/2″) |
| Low Drive Shaft | 3 | 401526 | 10184 | LOCKWASHER (3/4″) |
| Low Drive Shaft | 4 | 401526 | 11886 | FLEXLOC – LOCKNUT (1/2″ UNF) |
| Low Drive Shaft | 5 | 401526 | 14769 | CAPSCREW (1/2″ UNF X 3-1/4″) |
| Low Drive Shaft | 8 | 401526 | 401252 | GASKET |
| Low Drive Shaft | 9 | 401838 | 10029 | CAPSCREW (1/2″ UNC X 1-1/2″) |
| Low Drive Shaft | 10 | 401838 | 10182 | LOCKWASHER (1/2″) |
| Low Drive Shaft | 11 | 401838 | 10918 | BEARING (SKF 22234) |
| Low Drive Shaft | 12 | 401838 | 46125 | KEY (1-1/2″ X 1-1/4″ X 6-1/2″) |
| Low Drive Shaft | 17 | 401838 | 401131 | KEY |
| Input Shaft | 1 | 401528 | 10096 | CAPSCREW (1″ UNC X 4″ LONG) |
| Input Shaft | 2 | 401528 | 10131 | NUT (1″ UNC) |
| Input Shaft | 3 | 401528 | 10186 | LOCKWASHER (1″) |
| Input Shaft | 4 | 401528 | 610047 | SHIM (1/4″) |
| Input Shaft | 5 | 401528 | 610048 | SHIM (16GA.) |
| Input Shaft | 6 | 401528 | 610049 | SHIM (28GA.) |
| Input Shaft | 7 | 401528 | 610050 | SHIM (0.005″) |
| Input Shaft | 8 | 401838 | 111 | BEARING (SKF-22228) |
| Input Shaft | 9 | 401838 | 9396 | KEY (1-1/4″ X 6″ LONG) |
| Input Shaft | 10 | 401838 | 10079 | CAPSCREW (7/8″ UNC X 2-1/4″ LONG) |
| Input Shaft | 11 | 401838 | 10131 | NUT (1″ UNC) |
| Input Shaft | 13 | 401838 | 10186 | LOCKWASHER (1″) |
| Input Shaft | 14 | 401838 | 12284 | LOCKNUT (7/8″ UNC) |
| Input Shaft | 15 | 401838 | 17744 | CAPSCREW (1/2″ UNC X 1-1/2″ LONG) |
| Input Shaft | 16 | 401838 | 400579 | KEY (1-1/4″ X 7/8″ X 9-1/2″) |
| Input Shaft | 17 | 401838 | 400491 | SPROCKET (19 TEETH) |
| Input Shaft | 18 | 401838 | 401013 | SPROCKET (22 TEETH) |
| Input Shaft | 22 | 401838 | 420730 | SPROCKET – OIL PUMP |
| Input Shaft | 23 | 401838 | 500031 | KEY (1-1/4″ X 6-3/4″ LONG) |
| Input Shaft | 24 | 401838 | 610047 | SHIM (1/4″) |
| DS Floating Shaft | 1 | 420726 | 10060 | CAPSCREW |
| DS Floating Shaft | 2 | 420726 | 10066 | CAPSCREW |
| DS Floating Shaft | 3 | 420726 | 10129 | NUT (3/4″ UNC) |
| DS Floating Shaft | 4 | 420726 | 10184 | LOCKWASHER (3/4″) |
| DS Floating Shaft | 5 | 420726 | 300068 | GASKET |
| DS Floating Shaft | 6 | 420726 | 401453 | CAPSCREW-SPECIAL |
| DS Floating Shaft | 7 | 420726 | 420635 | ADAPTER |
| DS Floating Shaft | 9 | 401841 | 9369 | KEY (1-1/4″ X 1-1/4″ X 6″) |
| DS Floating Shaft | 10 | 401841 | 10028 | CAPSCREW (1/2″NC X 1-1/4″) |
| DS Floating Shaft | 11 | 401841 | 10182 | LOCKWASHER (1/2″) |
| ODS Floating Shaft | 1 | 420727 | 10060 | CAPSCREW |
| ODS Floating Shaft | 2 | 420727 | 10066 | CAPSCREW |
| ODS Floating Shaft | 3 | 420727 | 10129 | NUT (3/4″ UNC) |
| ODS Floating Shaft | 4 | 420727 | 10184 | LOCKWASHER (3/4″) |
| ODS Floating Shaft | 5 | 420727 | 300068 | GASKET |
| ODS Floating Shaft | 6 | 420727 | 401453 | CAPSCREW-SPECIAL |
| ODS Floating Shaft | 7 | 420727 | 401251 | GASKET |
| ODS Floating Shaft | 9 | 401842 | 9369 | KEY (1-1/4″ X 1-1/4″ X 6″) |
| ODS Floating Shaft | 10 | 401842 | 10028 | CAPSCREW (1/2″NC X 1-1/4″) |
| ODS Floating Shaft | 11 | 401842 | 10182 | LOCKWASHER (1/2″) |
| Main Brake Assy | 1 | 401786 | 7980-P | CAPSCREW-HEX DRILLED HD |
| Main Brake Assy | 2 | 401786 | 25741 | COTTER PIN |
| Main Brake Assy | 3 | 401786 | 10028-P | CAPSCREW-HEX HD |
| Main Brake Assy | 4 | 401786 | 10033-P | CAPSCREW-HEX HD |
| Main Brake Assy | 5 | 401786 | 10045 | CAPSCREW-HEX HD |
| Main Brake Assy | 6 | 401786 | 10060-P | CAPSCREW-HEX HD |
| Main Brake Assy | 7 | 401786 | 10064-P | CAPSCREW-HEX HD |
| Main Brake Assy | 8 | 401786 | 10066-P | CAPSCREW-HEX HD |
| Main Brake Assy | 9 | 401786 | 10067-P | CAPSCREW-HEX HD |
| Main Brake Assy | 10 | 401786 | 10069 | CAPSCREW-HEX HD |
| Main Brake Assy | 11 | 401786 | 10129 | NUT-HEX |
| Main Brake Assy | 14 | 401786 | 10184 | LOCK WASHER |
| Main Brake Assy | 15 | 401786 | 16094 | FITTING – HYDRAULIC |
| Main Brake Assy | 16 | 401786 | 401784 | PIN – BRAKE |
| Main Brake Assy | 17 | 401786 | 10498 | COTTER PIN |
| Main Brake Assy | 18 | 401786 | 11895 | PLUG – PIPE |
| Main Brake Assy | 19 | 401786 | 33150 | KEY |
| Main Brake Assy | 21 | 401786 | 40419 | KEY |
| Main Brake Assy | 22 | 401786 | 12256 | BEARING – STRAIGHT ROLLER |
| Main Brake Assy | 23 | 401786 | 15166 | BEARING |
| Main Brake Assy | 24 | 401786 | 15167 | BEARING |
| Main Brake Assy | 25 | 401786 | 17797 | BEARING |
| Main Brake Assy | 26 | 401786 | 14730 | SPRING |
| Main Brake Assy | 27 | 401786 | 14795 | BUSHING |
| Main Brake Assy | 28 | 401786 | 401305 | PIN |
| Main Brake Assy | 29 | 401786 | 400259 | PIN |
| Main Brake Assy | 30 | 401786 | 10490 | COTTER PIN |
| Main Brake Assy | 31 | 401786 | 400330 | PIN |
| Main Brake Assy | 32 | 401786 | 400405 | PIN |
| Main Brake Assy | 33 | 401786 | 35925 | BUSHING |
| Main Brake Assy | 34 | 401786 | 400220 | BOLT – EYE |
| Main Brake Assy | 35 | 401786 | 400222 | LOCKNUT |
| Main Brake Assy | 36 | 401786 | 24533 | SCREW – KIT |
| Main Brake Assy | 39 | 401786 | 10083 | CAPSCREW-HEX, HD |
| Main Brake Assy | 40 | 401786 | 10130 | NUT-HEX |
| Main Brake Assy | 41 | 401786 | 27404 | BLOCK – BRAKE |
| Main Brake Assy | 42 | 401786 | 400341 | BAND – BRAKE |
| Main Brake Assy | 43 | 401786 | 400291 | PIN |
| Main Brake Assy | 44 | 401786 | 10175 | FLAT WASHER |
| Main Brake Assy | 45 | 401786 | 10185 | LOCK WASHER |
| Oil Pump Assy | 1 | 401386 | 10012 | CAPSCREW |
| Oil Pump Assy | 2 | 401386 | 10059 | CAPSCREW 3/4″ UNC x 1″ |
| Oil Pump Assy | 4 | 401386 | 10184 | LOCK WASHER 3/4″ |
| Oil Pump Assy | 5 | 401386 | 10256 | ELBOW |
| Oil Pump Assy | 6 | 401386 | 11708 | CHECK VALVE |
| Oil Pump Assy | 7 | 401386 | 36067 | HOSE ASSY |
| Oil Pump Assy | 8 | 401386 | 15595 | SPRAY NOZZLE |
| Oil Pump Assy | 9 | 401386 | 15797 | SPROCKET |
| Oil Pump Assy | 10 | 401386 | 15829 | ROLLER CHAIN |
| Oil Pump Assy | 13 | 401386 | 22805 | HEX SETSCREW 1/4″ UNC x 1/2″ |
| Oil Pump Assy | 14 | 401386 | 31035 | HOSE ASSY |
| Oil Pump Assy | 15 | 401386 | 31115 | HOSE ASSY |
| Oil Pump Assy | 16 | 401386 | 35235 | HOSE ASSY |
| Oil Pump Assy | 17 | 401386 | 37954 | HOSE ASSY |
| Oil Pump Assy | 18 | 401386 | 400967 | KEY – STRAIGHT |
| Oil Pump Assy | 19 | 401386 | 450514 | HOSE ASSY |
| DS Rotorseal Assy | 1 | 40070 | 10028-P | CAPSCREW |
| DS Rotorseal Assy | 2 | 40070 | 11046 | CAPSCREW |
| DS Rotorseal Assy | 3 | 40070 | 10127-P | NUT |
| DS Rotorseal Assy | 4 | 40070 | 10182-P | LOCK WASHER |
| DS Rotorseal Assy | 5 | 40070 | 10183 | LOCK WASHER |
| DS Rotorseal Assy | 6 | 40070 | 10573 | FITTING – ALEMITE |
| DS Rotorseal Assy | 7 | 40070 | 11227 | SEAL – ROTORSEAL |
| DS Rotorseal Assy | 8 | 40070 | 11989 | SEAL “O”-RING |
| DS Rotorseal Assy | 10 | 40070 | 15212 | RING – RETAINING |
| DS Rotorseal Assy | 11 | 40070 | 15213 | RING – RETAINING |
| DS Rotorseal Assy | 12 | 40070 | 15215 | BEARING – BALL |
| DS Rotorseal Assy | 13 | 40070 | 15216 | BEARING – BALL |
| DS Rotorseal Assy | 14 | 40070 | 15218 | RING – RETAINING |
| DS Rotorseal Assy | 15 | 40070 | 15219 | SEAL |
| DS Rotorseal Assy | 16 | 40070 | 15220 | SEAL |
| DS Rotorseal Assy | 17 | 40070 | 400757 | RING – RUB |
| DS Rotorseal Assy | 18 | 40070 | 400758 | RING – RUB |
| DS Rotorseal Assy | 19 | 40070 | 400762 | SPACER |
| DS Rotorseal Assy | 20 | 40070 | 400772 | SPACER |
| Case & Guard Assembly | 1 | 401752 | 4626 | GASKET |
| Case & Guard Assembly | 2 | 401752 | 400406 | GASKET |
| Case & Guard Assembly | 3 | 401752 | 400409 | GASKET |
| Case & Guard Assembly | 4 | 401752 | 400410 | GASKET |
| Case & Guard Assembly | 5 | 401752 | 400414 | GASKET |
| Case & Guard Assembly | 6 | 401752 | 400498 | GASKET |
| Case & Guard Assembly | 7 | 401752 | 400642 | GASKET |
| Case & Guard Assembly | 8 | 401752 | 401224 | GASKET |
| Case & Guard Assembly | 9 | 401752 | 420306 | GASKET |
| Case & Guard Assembly | 10 | 401752 | 450744 | GASKET |
| Case & Guard Assembly | 11 | 401752 | 5917 | GASKET |
| Case & Guard Assembly | 12 | 401752 | 10012 | CAPSCREW |
| Case & Guard Assembly | 13 | 401752 | 10027 | CAPSCREW |
| Case & Guard Assembly | 14 | 401752 | 10043 | CAPSCREW |
| Case & Guard Assembly | 15 | 401752 | 10044 | CAPSCREW (5/8″ UNC X 1-1/4″) |
| Case & Guard Assembly | 16 | 401752 | 10046 | CAPSCREW |
| Case & Guard Assembly | 17 | 401752 | 10128 | NUT |
| Case & Guard Assembly | 18 | 401752 | 10180 | LOCKWASHER |
| Case & Guard Assembly | 19 | 401752 | 10182 | LOCKWASHER (1/2″) |
| Case & Guard Assembly | 20 | 401752 | 10183 | LOCKWASHER (5/8″) |
| Case & Guard Assembly | 22 | 401752 | 10002 | CAPSCREW |
| Case & Guard Assembly | 23 | 401752 | 19048 | SEAL |
| Case & Guard Assembly | 24 | 401752 | 401227 | GASKET |
Field Failure Repair Case Studies
Case 1: Drum Clutch Air Line Failure
A mid-sized drilling contractor experienced repeated air leaks in the U1220 drum clutch air line assembly, causing inconsistent clutch engagement and 8+ hours of rig downtime. After replacing worn 3/8” elbows, quick release valves, and hose assemblies (Part Nos. 10236, 16000, 36599) with OEM-grade replacements, the pneumatic system pressure stabilized, eliminating leaks and restoring full clutch functionality with zero further downtime in 600+ operating hours.
Case 2: Brake Roller Assembly Wear
A rig operator reported uneven brake braking and premature roller degradation on the U1220 brake roller assembly, leading to unsafe stopping performance. Replacing worn rollers, springs, and cotter pins (Part Nos. 6155, 9724, 10485) restored uniform friction distribution, extended brake service life by 40%, and complied with field safety standards for drilling rig braking systems.
Case 3: Driveshaft Bearing & Seal Failure
A remote drilling site faced excessive vibration and lubricant leakage from the U1220 drumshaft assembly, caused by failed bearings and piston rings. Swapping in premium replacement bearings (Part No. 14527), piston rings (Part No. 14547), and gaskets eliminated leakage, reduced vibration by 65%, and allowed the rig to resume full-capacity drilling without mechanical issues.
Frequently Asked Questions (FAQ)
| Question | Answer |
| Are these parts direct OEM replacements for the Midco U1220? | Yes, every part matches original factory part numbers, drawing numbers, and tolerances for 100% bolt-on fitment with Midco U1220 drilling rigs, no modifications needed. |
| What is the durability rating for high-wear components like seals and friction linings? | High-wear parts are rated for 2,000+ operating hours under heavy drilling loads, with friction linings and seals engineered to outperform standard aftermarket alternatives in harsh conditions. |
| Can I purchase individual parts or only full assembly kits? | Both individual replacement parts and complete pre-assembled kits are available, allowing targeted repairs for small failures or full overhauls for major assembly issues. |
Purchasing Guidance & Value Proposition
Investing in these authentic Midco U1220 replacement parts eliminates the risks of subpar aftermarket components, reduces long-term maintenance costs, and keeps your drilling rig operating at peak efficiency. Each part is a proven solution for resolving technical failures, meeting industry performance standards, and maintaining rig reliability — making this parts lineup the definitive reference for both routine procurement and emergency repair planning.
Whether you need to stock critical spare parts for preventive maintenance, replace failed components to get your rig back online, or conduct a full system overhaul, this curated U1220 parts selection provides the quality, compatibility, and performance you need. Secure your supply of high-quality Midco U1220 replacement parts today to minimize downtime, protect your rig investment, and maintain consistent drilling operations.
