milwaukee J77A Hammer Drill User Manual

June 3, 2024
Milwaukee

milwaukee J77A Hammer Drill

milwaukee-J77A-Hammer-Drill-PRO

SERVICE PARTS LIST

SPECIFY CATALOG NO. AND SERIAL NO. WHEN ORDERING PARTS| REVISED BULLETIN| DATE Oct. 2020|
---|---|---|---
M18™ FUEL™ Brushless Hammer-Drill|
WIRING INSTRUCTION

SEE PAGE 2

|
CATALOG NO.        2804-20| STARTING                J77A

SERIAL NO.

|

milwaukee-J77A-Hammer-Drill-1

FIG.

1

| PART NO.

05-88-0019

| DESCRIPTION OF PART

M8.0 x 1 LH T-40 Chuck Screw

| NO. REQ.

(1)

|
---|---|---|---|---
2| 42-66-1006| 1/2” Keyless Chuck| (1)|
13| 06-82-7336| M4 x 20mm Pan Hd. ST T-10 Screw| (4)|
14| 06-82-7337| M4 x 20mm Washer Pan Hd. ST T-10 Scr.| (4)
16| 42-42-3001| Forward/Reverse Shuttle| (1)
17| 45-24-1045| Speed Change Lever| (1)
19| —————| Left Housing Halve – Support| (1)
20| —————| Belt Clip| (1)
21| 06-82-2500| 6-32 x 7mm Pan Hd. Taptite T-15 Screw| (2)
31| —————| Secondary Clamp Body| (1)
32| —————| Primary Clamp Body| (1)
33| —————| Threaded Side Handle| (1)
34| 44-10-4002| Speed Selector Slide| (1)
35| 40-50-9001| Detent Spring| (1)
36| —————| Right Housing Halve – Cover| (1)
38| —————| Bit Holder with Clip| (1)
39| 06-82-6350| M3 x 16mm Pan Hd. ST T-10 Screw| (5)

REMOVING THE CHUCK SCREW

Set the Speed Selector Slide (34) to the #1 setting. With the aid of a small pencil tip torch (or use an air reduction nozzle on a heat gun) apply heat into the chuck opening, directly to the head of reversing screw just prior to removing the screw. Place a T40 1/4” torx bit into the head of the reversing screw and place a 1/4” boxed end wrench over the hex on the T40 bit. It is recommended to use a 12”-18” metal tube or pipe as leverage over the boxed wrench. In a clockwise direction apply a slow, steady force on the ‘cheater bar’ to break the screw loose.

REMOVING THE KEYLESS CHUCK:
Tighten a 3/8” or 10mm Allen Key into the jaws of the chuck. Place the tool into a vise with soft jaws (this will require that you remove the belt clip from the tool). It is recommended to use a 12”-18” metal tube or pipe as leverage over the allen key. In a counter-clockwise direction apply a slow, steady force on the ‘cheater bar’ to break the chuck loose.

INSTALLING NEW CHUCK AND SCREW:
Torque Chuck to 1095 kg/cm (950.418 in/lbs or 28.93 ft/lbs) Torque Screw to 461 kg/cm (400.130 in/lbs or 33.34 ft/lbs).

WIRING

milwaukee-J77A-Hammer-Drill-2

  • Be sure that all mechanical and electrical components are placed firmly and squarely in the corresponding cavities of the left housing halve.
  • Be very careful and make sure that all wires and the wire ribbon are placed firmly down in wire channels and traps.
  • Make sure there are no interferences when installing the right housing half.

ATTENTION
OBSERVE PRECAUTIONS FOR HANDLING ELECTROSTATIC-SENSITIVE DEVICES

MILWAUKEE TOOL

www.milwaukeetool.com
13135 W. Lisbon Rd., Brookfield, WI 53005

References

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