Hitachi H 41SD Manuel utilisateur

-6-

PRODUCT NAME

Hitachi Demolition Hammer

Model H 41SD

LIST No.

H 41SD: F413

Nov. 2012

REPAIR GUIDE ---------------------------------------------------------------------------------------------------------------- 1

1. Precautions on disassembly and reassembly ----------------------------------------------------------- 1

STANDARD REPAIR TIME (UNIT) SCHEDULES -------------------------------------------------------------------- 8

CONTENTS Page

International Sales Division

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Be sure to disconnect the power cord plug from the wall outlet before conducting repair. Otherwise, the

motor may suddenly run, posing a very dangerous situation.

1. Precautions on disassembly and reassembly

[Bold] numbers in the descriptions below correspond to item numbers in the Parts List and exploded

assembly diagram for the Model H 41SD.

1. Disassembly of the hammering mechanism

(a) Second Hammer [12], Piston [23] and Striker [20]

Note that the front cover and the cylinder case cannot be loosened. Remove the cylinder case and

the crank case before removing the parts inside the cylinder case.

Remove the Hex. Socket Hd. Bolt (W/Flange) M5 x 16 [28] fixing the Crank Cover [29] and the Hex.

Socket Hd. Bolt (W/Flange) M5 x 12 [41] fixing the Hood [42], then the Crank Cover [29] and the

Hood [42] can be removed from the Crank Case [44]. Remove the Retaining Ring D45 [3] and the

Front Washer [4] fixing the Cylinder Case Cover [6], then the Cylinder Case Cover [6] can be

removed from the Cylinder Case Ass’y [5]. Remove the Hex. Socket Hd. Bolt (W/Flange) M6 x 25

[8] fixing the Cylinder Case Ass’y [5], then the Cylinder Case Ass’y [5],Striker[20], Second

Hammer [12], Damper [14], Damper Washer [13], Hammer Holder [2] and Retainer Damper [1]

can be removed from the Crank Case [44].

As the Piston [23] remains on the Crank Case [44] side, use the retaining ring puller to remove the

Retaining Ring for D10 Shaft [26], and then remove the Connecting Rod [24] from the Crank Shaft

[31]. The Striker [20] can be removed by lightly tapping on the Cylinder [19] with a plastic hammer.

If it does not come out easily, push the disassembled Piston [23] with the Connecting Rod [24]

back into the Cylinder [19], and then quickly pull them apart again. The Striker [20] can come out at

the same time as shown in Fig. 1 on the next page.

REPAIR GUIDE

Disassembl

-2-

(b) First Gear [45] and Crank Shaft [31]

Remove the Seal Lock Hex. Socket Hd. Bolt M6 x 35 [43], Hex. Socket Hd. Bolt (W/Flange) M5 x

16 [28] and Tapping Screw (W/Flange) D5 x 20 (Black) [69]. Remove the Crank Case [44] from the

Housing Ass'y [58] and Handle [76]. Remove grease from the Piston [23] side and the First Gear

[45] side of the Crank Case [44]. Use a retaining ring puller to remove the Retaining Ring for D40

Hole [32] fixing the Ball Bearing 6203DDCMPS2L [33]. At this time, turn the Crank Shaft [31] to

expose the hole of the Retaining Ring for D40 Hole [32] prior to removal. Use a hand press to press

the end face of the Crank Shaft [31], and then remove the First Gear [45] and the Crank Shaft [31]

from the Crank Case [44] as shown in Fig. 2 on the next page.

Striker [20]

Cylinder [19]

Damper [14] Second Hammer [12]

Cylinder case

Piston [23] Retaining Ring for D10 Shaft [26]

Crank Shaft [31]

Connecting Rod [24]

Damper Washer [13]

Retainer Damper [1] Hammer Holder [2]

Front cover ass’y

Cylinder Case Ass’y [5]

Fig. 1

-3-

Steel ball Front cover ass’y Cylinder case

Cylinder Case Ass’y [5]

2. Disassembly of the tool retainer

Use a snap ring remover to remove the retaining ring. The ring, slide grip, spring and six steel balls can

then be removed from the Cylinder Case Ass’y [5] as shown in Fig. 3 below.

Crank Shaft [31]

Crank Case [44]

Retaining Ring for D40 Hole [32]

Crank Case [44]

Crank Shaft [31]

First Gear [45]

Support

Ring

Spring

Retaining ring O-ring

Fig. 2

Fig. 3

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Conduct reassembly by reversing the order of the disassembly procedure. However, special attention

should be given to the following items.

1. Reassembly of the hammering mechanism

(a) First Gear [45] and Crank Shaft [31]

Press-fit the Oil Seal [35] into the Crank Case [44] and mount the O-ring (S-40) [34]. Then press-fit

the Ball Bearing 6203DDCMPS2L [33]. Use a retaining ring puller to mount the Retaining Ring for

D40 Hole [32]. Press-fit the Crank Shaft [31] into the Ball Bearing 6203DDCMPS2L [33]. Press-fit

the Crank Shaft [31] into the Distance Ring [36]. Fit the Feather Key 4 x 4 x 8 [27] into the groove

of the Crank Shaft [31] and then press-fit the First Gear [45] with a suitable jig, while holding the flat

portion of the Crank Shaft [31] with a steel bar. Before doing the press-fitting work above, make

sure that the Feather Key 4 x 4 x 8 [27] fits properly into the key groove of the First Gear [45] as

shown in Fig. 4 below.

(b) Second Hammer [12], Damper Washer [13], Damper [14], and Cylinder [19]

Fit the Damper Washer [13] and the Damper [14] onto the Second Hammer [12] and insert it into

the Cylinder [19] being careful of the direction of the Damper Washer [13]. Perform reassembly

aligning the inclined surface inside the Damper Washer [13] with the inclined surface of the Second

Hammer [12] as shown in Fig. 5 on the next page.

Reassembl

Oil Seal [35]

Ball Bearing 6203DDCMPS2L [33]

Feather Key 4 x 4 x 8 [27]

Retaining Ring for D40 Hole [32]

O-ring (S-40) [34]

Crank Shaft [31]

First Gear [45] Support

Steel bar

Distance Ring [36]

Fig. 4

-5-

Valve Cover [38]

Seal Lock Hex. Socket

Hd. Bolt M4 x 8 [40]

Sectional view of Valve [37]

Cylinder [19]

Damper Washer [13]

Stick the Felt [39] on the Valve Cover [38] mating their top edges after degreasing the location on

the Valve Cover [38] where the felt is to be adhered. Fix the Felt [39] to the Valve Cover [38] with

the O-ring (S-10) [87]. Insert the Valve [37] into the Crank Case [44]. Fix the Valve Cover [38] in

place using the Seal Lock Hex. Socket Hd. Bolt M4 x 8 [40] by matching it to the seating surface of

the Crank Case [44]. Confirm that ĭ2.4 hole of the Valve [37] can be seen from the ĭ2 hole of the

Valve Cover [38] as shown in Fig. 6 below. Note that grease will leak if the Valve [37] is not

properly inserted. (Fig. 6)

The Felt [39] must not stick out

from the Valve Cover [38].

Felt [39]

ĭ2.4

ĭ2 hole of the Valve Cover [38]

Valve [37]

O-ring (S-10) [87]

Second Hammer [12]

Damper [14]

Fig. 5

Fig. 6

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• Filling special grease (for the hammer and hammer drill)

Connecting Rod [24] side in the Crank Case [44]: 35 g

• Applying special grease (for the hammer and hammer drill)

Inner circumferences on the Piston [23] side of the Connecting Rod [24], sliding portion of the Second

Hammer [12], sliding portion of the Striker [20], O-ring [21] mounted on the Striker [20] and Piston [23],

O-ring (A) [15] of the Piston [23], and lip portions along the inner circumference of the Oil Seal [35] and

Damper [14]

• Filling Hitachi Motor Grease No. 29

First Gear [45] side and Gear Cover Ass’y [48] side in the Crank Case [44]: 10 g in total

• Applying Hitachi Motor Grease No. 29

Needle Bearing M661 [46] and pinion portion of the Armature [52]

• Applying Doubrex 251

Damper Washer [13], inner circumference of the Second Hammer [12], around the Hammer Holder [2],

inner circumference of the Hammer Holder [2], and Retainer Damper [1]

• Applying Molub-Alloy No. 777-1

Inner circumference of the Needle Bearing [25]

Apply screw locking agent TB1401 to all hex. socket head bolts M5 and M6.

NOTE: Be sure to apply screw locking agent (Three Bond TB1401) to the threads during

reassembly. Otherwise, any bolt loosened due to vibration may damage the tool body.

M6 • Seal Lock Hex. Socket Hd. Bolt M6 x 35 [43] and Seal Lock Hex. Socket Hd. Bolt M6 x 20 [49]

(For mounting the housing and crank case) ------------ 9.8 ± 0.98 N•m (100 ± 10 kgf•cm)

• Hex. Socket Hd. Bolt (W/Flange) M6 x 25 [8]

(For mounting the cylinder case) -------------------------- 12.7 N•m (130 kgf•cm)

M5 • Hex. Socket Hd. Bolt (W/Flange) M5 x 12 [41]

(For mounting the hood) ------------------------------------- 3.92 ± 0.49 N•m (40 ± 5 kgf•cm)

• Hex. Socket Hd. Bolt (W/Flange) M5 x 16 [28]

(For mounting the handle) ----------------------------------- 5.88 ± 0.98 N•m (60 ± 10 kgf•cm)

• Hex. Socket Hd. Bolt (W/Flange) M5 x 16 [28]

(For mounting the crank cover) ---------------------------- 7.84 N•m (80 kgf•cm)

M4 • Seal Lock Hex. Socket Hd. Bolt M4 x 8 [40]

(For mounting the valve cover) ----------------------------- 4.41 ± 0.49 N•m (45 ± 5 kgf•cm)

• Tapping screw (w/flange) D5 ------------------------------- 2.94 ± 0.49N•m (30 ± 5 kgf•cm)

• Tapping screw (w/flange) D4 ------------------------------- 1.96 ± 0.49 N•m (20 ± 5 kgf•cm)

+30

+2.94

+1.96

+20

lication of lub

icant

htenin

tor

-7-

(1) Wiring diagram for products without a noise suppressor

(2) Wiring diagram for products with a noise suppressor

Upon the completion of disassembly and repair, measure the insulation resistance and dielectric strength.

Insulation resistance: 7 Mȍor more using a 500 VDC megohm tester

Dielectric strength: 4,000 VAC/minute, with no abnormalities (220 to 240 V)

(110VforU.K.products)

2,500 VAC/minute, with no abnormalities (110 to 127 V)

(ExceptforU.K.products)

After no-load operation for 30 minutes, the no-load current values should be as follows:

Voltage (V) 110 220 230 240

Current (A) max. 4.2 2.1 2.0 1.9

Switch

Stator ass’y

Plug

Armature ass’y

Connector or

illa

terminal

Noise suppressor

Switch

Stator ass’y

Plug

Armature ass’y

Pilla

terminal

Connecto

Internal wirin

Insulation tests

No-load current value

-8-

MODEL Variable

Fixed 10 20 30 40 50 60 min

H 41SD

General Assembly

O-ring

Second

Hammer

Damper

Washer

Damper

O-ring (A)

Handle

Cylinder

Striker

O-ring x 2

Piston

Connecting

Rod

Needle

Bearing

Gear Cover

Ass’y

Needle Bearing

Armature

Ball Bearing

(6201DD)

Ball Bearing

(608VV)

Crank Shaft

Ball Bearing

(6203DD)

Oil Seal

First Gear

Housing Ass’y

Stator Ass’y

Crank Case

Work Flow

Handle Cover

Switch (B)

Cord

Cord Armor

Tail Cover

Crank Cover

O-ring

Retainer

Damper

Hammer

Holder

Cylinder Case

Ass’y

STANDARD REPAIR TIME (UNIT) SCHEDULES

Model H 41SD

HAMMER

LIST NO. F413

2012·11·16

(E2)

501 502

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