Manual Hitachi DH50MR (page 11 of 64) (English, German, Dutch, French, Italian, Portuguese, Spanish)

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(4) To remove the drill bit (taper shank), insert the

cotter into the slot of the taper shank adapter and

strike the head of the cotter with a manual hammer

supporting on a rest. (Fig. 13)

USING DRILL CHUCK, CHUCK ADAPTER

Note that this machine can be used at “rotation only”

if separately sold parts such as drill chuck and chuck

adapter are attached. Use it with the selector lever

positioned at “rotation + hammering”.

CAUTION:

During operation, be sure to grip the handle and

the side handle firmly to prevent your body from

swaying.

(1) Switching to “rotation + hammering”

For switching to “rotation + hammering”, follow the

same procedures mentioned in [3. When drilling at

“rotation + hammering”].

(2) Attaching chuck adapter to drill chuck (Fig. 14)

(a) Attach the chuck adapter to the drill chuck.

(b) The SDS max shank of the chuck adapter is

equivalent to the drill bit. Therefore, follow the

same procedure as [How to install tool] for

attaching and detaching.

(3) Drilling

(a) Even if you apply more-than-required pressure to

the machine body, drilling can never be performed

as quickly as you expect. Applying more force or

pressure to the machine body than what is needed,

on the contrary, damages the drill tip, resulting in

the declined working efficiency and shortened life

of this machine.

(b) A drill can snap sometimes when drilling is almost

finished. It is important to relax your thrusting

pressure when drilling is nearing the end.

HOW TO HANDLE A CORE BIT

When a core bit is used, large diameter holes and blind

holes can be drilled. In this case, use optional

accessories for core bits (such as a center pin and core

bit shank) for more efficient operation.

1. Mounting

CAUTION:

Prior to mounting a core bit, always disconnect the

plug from the power supply receptacle.

(1) Mount the core bit on the core bit shank. (Fig. 15)

Before that, feed oil to the screw portion of core

bit shank for easy dismounting.

(2) Mount the core bit shank on the main body in the

same manner as in mounting the drill bit and the

bull point. (Fig. 16)

(3) Insert the center pin into the guide plate until it

reaches the extremity.

(4) Fit in the guide plate by aligning its concaved

portion with the core bit tip. When the position of

the concave is shifted by turning the guide plate

right or left, the guide plate never slips off even

when the drill is used in a downward direction.

(Fig. 17)

2. Drilling holes

(1) Insert the plug into a receptacle.

(2) A spring is built in the center pin. By straightly and

gently pressing it to the wall or floor surface, the

entire surface of the core bit tip attains contact to

start the hole drilling job. (Fig. 18)

(3) When the hole depth reaches approximately 5 mm,

the hole position can be determined. Then remove

the center pin and guide plate from the core bit

and continue the hole drilling job.

CAUTION:

When removing the center pin and guide plate,

always disconnect the plug from the receptacle.

3. How to dismount the core bit

⅜ By holding the rotary hammer (with the core bit

inserted) in an upward position, drive the rotary

hammer to repeat impact operation two or three

times, whereby the screw is loosened and the rotary

hammer becomes ready for disassembly. (Fig. 19)

⅜ Remove the core bit shank from the rotary hammer,

hold the core bit with one hand, and strongly strike

the head of the SDS max shank portion of the core

bit shank with a manual hammer two or three

times, whereby the round head screw is loosened

and the rotary hammer is ready for disassembly.

(Fig. 20)

HOW TO REPLACE GREASE

This machine is of full air-tight construction to protect

against dust and to prevent lubricant leakage. Therefore,

the machine can be used without lubrication for long

periods. Replace the grease as described below.

1. Grease replacement period

After purchase, replace grease after every 6 months

of usage. Ask for grease replacement at the nearest

Hitachi Authorized Service Center. Proceed for

replacement of grease.

2. Grease replenishment

CAUTION:

Before replenishing the grease, turn the power off

and pull out the power plug.

(1) Remove the crank cover and wipe off the grease

inside. (Fig. 21)

(2) Supply 60 g of Hitachi Electric Hammer Grease A

(Standard accessory, contained in tube) to the crank

case.

(3) After replenishing the grease, install the crank cover

securely.

NOTE:

The Hitachi Electric Hammer Grease A is of the low

viscosity type. If necessary purchase from an Hitachi

Authorized Service Center.

MAINTENANCE AND INSPECTION

1. Inspecting the tool

Since use of a dull tool will degrade efficiency and

cause possible motor malfunction, sharpen or

replace the tool as soon as abrasion is noted.

2. Inspecting the mounting screws

Regularly inspect all mounting screws and ensure

that they are properly tightened. Should any of the

screws be loose, retighten them immediately. Failure

to do so could result in serious hazard.

01Eng_DH50MRY_WE 08/4/23, 11:3410

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Hitachi DH50MR Manual

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