Product Description
**Milwaukee parts change not only by model# but also by serial number. Milwaukee's site lets you look up your tool's parts diagram. Enter Cat# and Select Service Parts. Also match Serial Number.
Milwaukee Crankshaft
Model Number: 45-08-0103
The Milwaukee 45-08-0103 is a genuine OEM Crankshaft for the M12 FUEL Extended Reach Ratchets, the 3058-20 (1/4 in.), 3059-20 (3/8 in.), and 3055-20 (1/2 in.). The crankshaft is the part that turns the motor's rotation into the ratchet's drive: driven through the planetary gear train, its offset, or eccentric, pin rides in the yoke and swings it back and forth, and that oscillation drives the anvil that turns the socket. Everything the ratchet puts out passes through this shaft, so it is machined and hardened to take the full load. Because it carries the tool's torque through an eccentric pin spinning at speed, a worn, scored, or seized crankshaft causes lost power, play, knocking, or a ratchet head that will not drive. Replacing it with the genuine Milwaukee OEM crankshaft restores smooth, full-torque drive with the correct fit in the gear case and yoke, where an off-spec shaft may not fit the bearings, bushing, or yoke correctly.
This crankshaft is identified as the Crankshaft on the Milwaukee service parts lists for the M12 FUEL Extended Reach Ratchets: Figure 22 on the 3058-20 (serial R89A) and Figure 23 on the 3059-20 (serial R90A) and 3055-20 (serial R91A). The same crankshaft serves all three drive sizes in this extended reach family. It works with the yoke (45-98-0102) that its pin drives and the cylinder bushing (42-40-0041) in the gear case, which are separate items, and Milwaukee specifies applying grease to the crankshaft on assembly. Note that the standard M12 FUEL ratchets, such as the 2557-20 and 2558-20, use a different crankshaft supplied in their Yoke/Crankshaft/Bushing kit, so this part is for the extended reach 30-series ratchets. Because Milwaukee specifies service parts by serial number as well as catalog number, verify your catalog and serial number against the official Milwaukee service parts diagram before ordering.
Features
- Genuine Milwaukee OEM crankshaft
- For the M12 FUEL Extended Reach Ratchets
- Fits the 3058-20 (1/4 in.), 3059-20 (3/8 in.), and 3055-20 (1/2 in.)
- Turns the motor's rotation into the ratchet's drive
- Eccentric pin rides in the yoke and swings it to drive the anvil
- Carries the tool's full torque, machined and hardened for the load
- Figure 22 on the 3058-20; Figure 23 on the 3059-20 and 3055-20
- The same crankshaft serves all three extended reach drive sizes
- Works with the yoke (45-98-0102) and cylinder bushing (42-40-0041)
- Milwaukee specifies greasing the crankshaft on assembly
- Different from the standard 2557-20 and 2558-20 ratchet crankshaft
- Replace if the shaft is worn, scored, seized, or knocking
- Sold individually
Specifications
- Manufacturer: Milwaukee Tool
- Part Number: 45-08-0103
- Official Description: Crankshaft
- Component Type: Ratchet drive crankshaft (eccentric)
- Primary Fitment: Milwaukee M12 FUEL Extended Reach Ratchets 3058-20 (1/4 in.), 3059-20 (3/8 in.), 3055-20 (1/2 in.)
- Also Referenced On: Serials R89A / R90A / R91A; verify using Milwaukee's online parts lookup
- Parts Diagram Position: Figure 22 (3058-20); Figure 23 (3059-20 and 3055-20)
- Quantity: Sold individually (1 crankshaft)
- Part Type: Genuine Milwaukee OEM Replacement Part
Includes
- (1) Crankshaft
The yoke (45-98-0102) and cylinder bushing (42-40-0041) are NOT included and are sold separately. This is the extended reach ratchet crankshaft, not the standard 2557-20 and 2558-20 ratchet crankshaft, so confirm your tool before ordering. Always verify by serial number using Milwaukee's online parts lookup before ordering.
