Product Description
**Milwaukee parts change not only by model# but also by serial number. To look up your tools parts break down on Milwaukee's website please click here:
Milwaukee Front Gearcase Housing
Model Number: 31-40-0012
The Milwaukee 31-40-0012 is a genuine OEM Front Gearcase Housing for the forward end of an SDS rotary hammer. This is the forward structural shell of the gearcase: it encloses and supports the front of the hammer mechanism and the spindle, provides the bearing bore that carries the front spindle bearing, and forms the front structural interface between the gearcase and the outer tool body. This part is the housing itself. It is the structural component that sets the spindle's front-end alignment, so a cracked, broken, or worn front housing lets the spindle run out of true, which shows up as vibration, poor performance, and accelerated wear on the spindle and hammer components. Replacing it with the correct genuine Milwaukee OEM housing restores proper front-end support, correct bearing bore geometry, and a sound gearcase enclosure, which an aftermarket or damaged housing cannot be counted on to provide.
Because Milwaukee Tool specifies replacement parts by both catalog number and serial number, always verify your tool's serial number against the official Milwaukee service parts diagram before placing your order, since running production changes can alter part compatibility within the same catalog number. This front housing is documented on the tool's SDS rotary hammer service parts list, where it works with the front spindle bushing, bushing spacer, spring seal, and needle bearing that mount into it, and with the SDS spindle sleeve assembly, locking plate, selector knob, and the spindle, brake ring, and anvil of the hammer mechanism. Those components are separate parts that transfer from your existing tool or are ordered individually, so refer to your tool's parts diagram for the correct companion part numbers, and inspect the front bushing, bearing, and seals when replacing the housing since these parts work together at the front of the tool. Because replacing the front housing involves opening the gearcase, follow the correct service procedure and re-grease the mechanism with the Milwaukee-specified grease on reassembly.
Features
- Genuine Milwaukee OEM service part, not an aftermarket substitute
- Front Gearcase Housing, the forward structural shell for an SDS rotary hammer
- Encloses and supports the front of the hammer mechanism and spindle
- Provides the bearing bore that carries the front spindle bearing
- Forms the front interface between the gearcase and the tool body
- Sets the spindle's front-end alignment for smooth operation
- The housing shell itself, a structural part
- Restores front-end support and correct bearing bore geometry after damage
- Manufactured to Milwaukee specification for correct fit and alignment
- Front bushing, spacer, seal, and needle bearing transfer from your tool or order separately
- Works with the SDS spindle sleeve, locking plate, and hammer mechanism parts
- Verify catalog number and serial number before ordering
Specifications
- Manufacturer: Milwaukee Tool
- Part Number: 31-40-0012
- Official Description: Front Housing (front gearcase housing)
- Component Type: Front gearcase housing shell
- Primary Fitment: SDS rotary hammer - verify by catalog and serial number
- Works With: Front spindle bushing, bushing spacer, spring seal, needle bearing, SDS spindle sleeve assembly, and hammer mechanism
- Also Referenced On: Verify additional applications using Milwaukee's online parts lookup
- Parts Diagram Position: Figure 2 on the tool's service parts list
- Quantity: Sold individually, (1) required per tool
- Part Type: Genuine Milwaukee OEM Replacement Part
Includes
- (1) Milwaukee 31-40-0012 Front Gearcase Housing
This is the housing only. The front spindle bushing, bushing spacer, spring seal, needle bearing, mounting screw, SDS spindle sleeve assembly, spindle, brake ring, anvil, and other hammer mechanism components are NOT included, vary by tool, and are sold separately or transfer from your existing tool - refer to your tool's parts diagram for the correct part numbers and quantities. Always verify by serial number using Milwaukee's online parts lookup before ordering.
