Milwaukee 5339-20 Setup guide
58-92-5305 d1 022005
Cat. No. 5339-20
SDS Max Demolition Hammer
Cat. No. 5342-20
SDS Max Rotary Hammer
MILWAUKEE ELECTRIC TOOL CORPORATION
13135 W. LISBON ROAD • BROOKFIELD, WISCONSIN 53005-2550
REPAIR
INSTRUCTIONS
2
PAGE
INSTRUCTIONS
REPAIR
58-92-5305 d1
Special Tools
Require –Forcing discs 61-10-0011
–Hex key 4 mm
–Hex key 5 mm
–Sleeve 61-10-0013
–Pin-type face spanner 61-10-0012
–Spindle Fixture (optional) 61-30-0290
Important!–Before beginning the maintenance work, perform an initial check with a high voltage test.
–Before performing repair work, disconnect the power cord from the electrical outlet!
Disassembly
Removing the
auxiliary handle 1Remove handle (1) by turning it counter-
clockwise.
Disassembling
the handle 1Unscrew knob (3) and remove screw (1).
2Press spring ring (2) in direction of the ar-
rows and remove handle (4).
1
1
34
2
61
-
10
-
0011
61
-
10
-
0012
61
-
10
-
0013
61
-
30
-
0290
3
PAGE
INSTRUCTIONS
REPAIR
58-92-5305 d1
Removing the
spring ring 1Remove both retainers (1).
2Slightlyspreadspringring(2)andpullitoff
the machine towards the front.
Removing the
end cover cap ☞Position machine in a vertical position.
1Depress sleeve (2) and remove end cover
cap (1) with aid of a screwdriver.
2Remove sleeve (2).
3Remove retaining ring (3).
4Remove the following parts:
–damping element (4)
–damping ring (5)
–interlock sleeve (6).
☞Removing/leveringoff damping ring(5)
prior to removing retaining rings (3) will
be an alternative method of spindle
disassembly
Removing the
interlock
elements
1Depress interlock plate (2) against pres-
sure springs (3) until interlock elements
(1) are released. Remove them, if neces-
sary with aid of a screwdriver.
2Remove the following parts:
–interlock plate (2)
–pressure spring (3),
–washers (4).
☞Usingservicefixture#61-30-0290,with
two legs removed, will allow equal
pressure to be applied to both sides of
the interlocking elements for easy re-
moval.
1
1
2
1
2
3
4
5
6
1
2
3
4
4
PAGE
INSTRUCTIONS
REPAIR
58-92-5305 d1
Removing the
seal retainer 1Remove four screws (1) with a 5 mm hex
key.
2Turn seal retainer (2) 45° and remove it
with a plastic face hammer from below
(see illustration).
☞Removal of seal retainer (2) only re-
quires light hammer blows at each of
the four screw holes. Striking seal re-
tainer with heavy blows can damage
retainer.
Disassembling
the seal retainer 1Remove outer o-ring (2) from seal retainer
(1).
2Remove inner seal ring (3) from seal re-
tainer (1).
3Remove retaining ring (4) from the gear-
box.
Removing the up-
per gear box cov-
er
1Remove six screws (1) with washers from
the gear box cover.
2Remove gasket (2) from groove of gear
box (3).
1
2
2
1
2
3
44
2
1
3
5
PAGE
INSTRUCTIONS
REPAIR
58-92-5305 d1
Removing the
lever 1Removeadjustingplateassembly(4)from
pin (2) located on lever (1).
2Squeeze spring (5) together at the bottom
side of lever (1) and remove lever from
gear box cover.
3Remove O-ring (3).
☞When removing adjusting plate (4)
from pin (2) take care to not bend
spring assembly.
Combined
drill/chisel
hammer:
Removing
spindle assembly
1Loosen spindle assembly (1) by turning it
slightly and pulling it from the front of the
gear box (in direction of arrow).
☞In case of stiffness, lightly tap gear box
(2) with a plastic face hammer. Spindle
assembly (1) will be released in direc-
tion of arrow.
Chisel
hammer:
Removing
spindle assembly
1Remove retaining ring (3) using retaining
ring pliers from spindle groove.
2Loosen spindle assembly (5) by turning it
slightly and pulling it from front of gear box
(in direction of arrow).
☞In case of stiffness, lightly tap gear box
(4) with a plastic face hammer. Spindle
(5) will be released in direction of ar-
row.
3Remove retaining ring (3), washer (2) and
O-ring (1) from gear box (4).
1
2
3
5
4
12
321
4
5
6
PAGE
INSTRUCTIONS
REPAIR
58-92-5305 d1
Disassembling
the spindle as-
sembly
1Remove thrust collar (1) from spindle (4).
Remove O-ring (2) from thrust collar (1).
2Remove ram assembly (5) from spindle
(4) by tapping it lightly with a plastic face
hammer.
Remove O-ring (6) from ram (5).
3Remove retaining ring (3) from spindle.
Disassembling
the spindle as-
sembly
1Remove following parts from spindle (D):
–roller race (1)
–washer (2)
–o-ring (3)
–attachment washer (4).
2Remove four rollers (C) with a magnetic
screwdriver from spindle (D).
☞In case of stiffness, remove rollers (C)
with light taps with a plastic face ham-
mer. Twist the spindle and driver back
and forth while tapping to aid in easy
roller removal.
3Remove striker guide (5) from spindle (D).
4Remove striker (7) and o-ring (6) from
striker guide (5).
5Remove three o-rings (8) from striker (7).
6Remove thrust collar (9), pressure o-ring
(A), and washer (B) from spindle (D).
12
3
4
56
A
1
9
2
5
678
BC
D
34
7
PAGE
INSTRUCTIONS
REPAIR
58-92-5305 d1
Removing the
piston assembly 1Position piston assembly (5) into the back
dead center position.
2Combined drill/chisel hammer:
Remove spindle bevel gear (3) from gear
box.
3Remove set collar (1) and locking plate (2)
from gear box.
4Removethe piston assembly (5) upwards.
Remove o-ring (4) from piston (5).
Disassembling
the motor hous-
ing
1Remove the two screws (1) from service
cover (2) and remove service cover (2) in
direction of arrow.
2Lift springs (3) on both sides of carbon
brush cover and pull carbon brushes out
(4). Pull the carbon brush leads off.
3Remove four hex head screws (4) from
the motor housing.
4Pull gear box (5) with the armature from
the motor housing.
☞Carbon brush set consists of two
brushes, one brush has a secondary
lead incorporated into it. This lead
must be disconnected from the elec-
tronic module at this time.
1
2
3
45
5
3
4
124
8
PAGE
INSTRUCTIONS
REPAIR
58-92-5305 d1
Disassembling
the armature 1Remove three hex head screws (8) from
bearing end plate (7) and pull complete ar-
mature assembly (B) with bearing end
plate (7) from gear box (1).
2Remove o-ring (2) from gear box (1).
3Insert the pin-type face spanner (61-10-
0012)(3)intosealnut(4)andremoveseal
nut (4) counter-clockwise. Remove bear-
ing end plate (7).
4Remove retaining ring (5) from bearing
end plate (7) and press out bearing (6).
5Separate fan (9) from armature (B) with
forcing discs (A).
6Remove bearing cup (D) and press off
bearing (C).
☞If armature fan (9) requires removal,
use service fixture (A) #61-10-0011 as
illustrated. (Follow fan reassembly pro-
cedure).
Removing the
crank wheel 1Remove following parts from gear box (8):
–crank wheel (1)
–thrust washer (2)
–thrust bearing (3)
–thrust washer (4).
2Combined drill/chisel hammer:
Additionally remove clutch (5) from gear
box (8).
3Remove caged needle bearings (6 and 7)
by simply lifting them out of the gear box.
☞The chisel hammer does not have a
clutch (5) and needle bearings (6 & 7)!
☞No cleaning solvent should penetrate
into clutch; wipe any old lubrication off
clutch assembly using a dry, clean rag.
9
23456
8
7
A
B
CD
1
5
6
7
8
1
3
4
2
9
PAGE
INSTRUCTIONS
REPAIR
58-92-5305 d1
Removing the
lower gear box
cover
1Remove two screws (1) and remove lower
gear box cover (2).
☞The exposed plane surface serves
only for manufacturing the gear box
and has no other function!
Disassembling
the electronic
component
1Remove the four screws (1) from the
handle and remove handle half (2).
2To remove cord leads, remove/loosen two
screws (4) from switch (3).
3Remove screws (5) from cord clamp (6)
and remove the cord (7).
4Remove the following parts:
–four o-rings (C)
–two wires (D)
–two screws (A)
–two carbon brush holders (B)
–electronic part (E)
–four screws (8)
–side handle plate (9).
12
3
4
5
6
D
8
9
A
BC
E
7
1
2
10
PAGE
INSTRUCTIONS
REPAIR
58-92-5305 d1
Removing the
anti-vibration
mechanism
and the field
1Remove air deflector ring (5).
2Remove screw (4). Remove the following
partsof the anti-vibration mechanismfrom
motor housing (8):
–thrust piece (1)
–spring (2)
–vibration lever(3).
☞Caution: Screw (4) and vibration spring
cover (1) are under spring pressure.
3Remove two screws (7) and remove field
(6) from motor housing (8).
☞Should the field be stuck, tap motor
housing (8) lightly with a plastic face
hammer.
12
3
4
56
78
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