Milwaukee M18™ Transfer Pump Service Parts List
Bulletin No. 54-05-2770
Revised Bulletin Date: Sep. 2023
Catalog No.: 2771-20
Serial No.: H59A
Product Overview
This document provides the service parts list and wiring instructions for the Milwaukee M18™ Transfer Pump, Model 2771-20.
Note: Model 2771-20 (Serial Break 'A') is designed to operate with various M18 REDLITHIUM™ batteries (1.5 Ah to 9.0 Ah). For compatibility with the 12.0 Ah battery (48-11-1812), Upgrade Service Kit 14-46-0089 is required.
Parts Breakdown
The following table lists the components of the M18™ Transfer Pump. Component parts (indicated by a small number) are included when ordering the assembly (indicated by a large number).
The pump assembly features a main housing, motor, pump head, and impeller. Key components include the front and rear housings, motor end cover, battery door with latch and pin, and various screws and seals. The diagram shows an exploded view, illustrating how these parts fit together. Specific parts like the flexible impeller kit, brass fitting, and PCBA are also detailed.
| FIG. | PART NO. | DESCRIPTION OF PART | NO. REQ. |
|---|---|---|---|
| 1 | 06-82-0048 | M5 x 30 Screw Kit (Set of 4) | (1) |
| 2 | 14-38-0018 | Impeller Window Kit | (1) |
| 3 | Front Cover | (1) | |
| 4 | Lens | (1) | |
| 5 | Window | (1) | |
| 6 | 49-16-2771 | Flexible Impeller Kit w/ Grease | (1) |
| 7 | O-Ring | (1) | |
| 8 | Impeller | (1) | |
| 9 | 43-33-0026 | Brass Fitting 1/2" NPT x 3/4" GHT | (2) |
| 10 | 31-21-0021 | Battery Door Kit | (1) |
| 11 | Battery Door | (1) | |
| 12 | Battery Door Pin | (1) | |
| 13 | 12-20-0083 | Service Nameplate (Not Shown) | (1) |
| 15 | 43-40-0207 | Right Half Protective Frame | (1) |
| 16 | 31-44-0542 | Right Half Housing | (1) |
| 17 | 44-52-0060 | Motor Cushion | (1) |
| 18 | 28-28-0047 | Arrow Back Plate | (1) |
| 19 | 43-40-0206 | Left Half Protective Frame | (1) |
| 20 | 31-44-0541 | Left Half Housing | (1) |
| 21 | 44-74-0078 | Battery Door Latch | (1) |
| 22 | 40-50-0429 | Spring | (1) |
| 23 | 44-74-0074 | Door Latch Bay | (1) |
| 24 | 44-66-0177 | Axis Pin | (1) |
| 25 | 31-15-0104 | Switch Button | (1) |
| 26 | 42-36-0038 | Switch Linkage | (1) |
| 27 | Battery Terminal | (1) | |
| 28 | PCBA Assembly | (1) | |
| 29 | 22-68-0019 | Motor End Cover | (1) |
| 30 | 16-01-0113 | Motor | (1) |
| 31 | 45-88-0144 | Front Cover | (1) |
| 32 | 30-16-0013 | Rubber Washer | (2) |
| 33 | Threads Cap | (1) | |
| 34 | Pump Head | (1) | |
| 35 | 42-32-0011 | Oil Seal NBR | (1) |
| 36 | 05-74-0446 | Pump Service Assembly | (1) |
| 37 | 05-74-0444 | M4 x 16 Screw | (13) |
| 38 | 05-74-0443 | M3 x 9 Screw | (1) |
| 39 | 05-74-0442 | M4 x 10 Screw | (16) |
| 40 | 05-74-0441 | M4 x 12 Screw | (2) |
| 41 | 22-09-0051 | M5 x10 Screw | (2) |
| 42 | Fuse | (1) | |
| 50 | 14-20-0578 | PCBA + Terminal Block Kit | (1) |
Wiring Instructions
Refer to Page 2 for detailed wiring information and screw torque specifications.
The internal wiring connects the motor (30) to the PCBA (28), which serves as the main control unit and houses the On/Off switch. The PCBA is also linked to the battery terminal (27) and protected by a fuse (41). Switch linkage components (24, 25, 26) are shown connecting the external switch button to the internal mechanism on the PCBA.
Screw Torque Specifications
| FIG. | PART NO. | WHERE USED | SEAT TORQUE (kgf-cm) | (lb-in) |
|---|---|---|---|---|
| 1 | 06-82-0048 | Front Cover | 11-15 | 10-13 |
| 36 | 05-74-0446 | Housing Support | 12-16 | 10-14 |
| 37 | 05-74-0444 | Housing Support | 6-8 | 5-7 |
| 38 | 05-74-0443 | Protective Frame | 7-9 | 6-8 |
| 39 | 05-74-0442 | Battery Bracket | 9-11 | 8-10 |
| 40 | 05-74-0441 | Pump Head | 10-13 | 9-11 |
| 42 | PCBA | 6-8 | 5-7 |
Notes
Note 9: Brass fittings are a standard size and should be available at most hardware stores.
Note 13: For proper adhesive system performance, ensure the surface is clean and dry. Clean with isopropyl alcohol using a lint-free applicator and allow to dry before applying labels or nameplates.
