How to Remove the Makita 2470 Rotary Hammer Switch

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How to repair the cartridge and percussion mechanism of the makita 2470 hammer drill barrel

Due to the ingress of dust, dirt, moisture, the internal lubricant becomes hard over time and does not fulfill its purpose. The punch starts to work with extraneous noise. Before repairing the punch, be sure to read the attached instructions for disassembling, lubricating, and assembling the components of the Makita 2450, 2470 punch. The layout of the Makita 2450 and 2470 punch will help to disassemble the failed parts and find the defective parts. And also we will tell how to disassemble the Makita 2450 puncher.

Content:

Disassembly of the Makita 2470 punch starts with the removal of the mode switch knob.

Punch disassembly procedure

Place the hammer drill on a clean surface.

When disassembling the mechanical part of a Makita 2450 or Makita 2470 rotary hammer, you must always remove the mode selector knob.

At the beginning of operation, the handle is set to the “Impact” mode (extreme right position clockwise).

How to Remove the Makita 2470 Rotary Hammer Switch

On the handle, using a screwdriver, poke and release the latch.

After removing the latch, the handle is moved to the leftmost position, in the "Drilling" mode.

The handle clamped with fingers is removed from the grooves of the housing.

Video instruction for disassembling the Makita 2450 punch mode selector knob

Video: How to put a mode switch on a Makita HR 2450 rotary hammer

How to set the mode knob
To install the mode switch in the case, you must:
insert the switch into the “drilling” position in the seat slot until it clicks;
turn the switch counterclockwise to the “strike” position;
move the switch with a click counterclockwise to the “drilling” position;
insert the spring and the red button;
insert the cover on top until it locks in place.
The mode switch is assembled.

At the second stage, you should disassemble the quick-detachable cartridge and repair the punch cartridge with your own hands. By the way, the cartridge needs to be disassembled only on models of the Makita 2470. The cartridge device is quite simple, and any person with a little knowledge of locksmithing skills can cope with its repair.

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Makita rotary hammer disassembly procedure

Repair of the perforator cartridge begins with the installation of the perforator vertically on the rear housing cover. The hrMakita hammer drill circuit will help you properly disassemble.
Is a Makita 2470 rotary hammer cartridge replacement needed? The answer can be obtained only after a complete disassembly of the cartridge with your own hands.
Using a screwdriver or puller, the boot is removed, the cartridge is released from the retaining ring, clutch cover, metal ring 20 pos. 4. Next, you need to carefully get the ball pos.20, remove the guide washer pos.5 and the conical spring pos.6 that supports it. The cartridge is disassembled.

The diagram below shows the design of the perforator cartridge.

The main malfunctions of the makita 2450 punch, causing defects in the operation of the chuck, are:

  • wear of a protective rubber boot pos.1;
  • relaxation of the retaining ring pos. 2 or its partial wear;
  • ball wear pos.20;
  • loss of elasticity of a conical spring pos.6 or its tension.

Repairing a perforator cartridge is not a complicated procedure and is usually easy to carry out by anyone who can hold a screwdriver in their hands.

If replacing a rubber boot, retaining ring, conical spring is not difficult, then replacing a new ball requires attention. The new ball must have a diameter of 7 mm ± 1 μm.
As lubricants, it is recommended to use a special grease developed for the Makita rotary hammer.
The grease has an index of Makita P-08361, Makita 183477-5 SDS-PLUS 30 g for the gearbox. Makarov 196804-7 grease is recommended for drill shanks.

When assembling the cartridge, install the conical spring with the narrow side facing the punch.

Video: How to Remove the Makita 2470 Rotary Hammer Switch


Do not forget, do-it-yourself cartridge repair requires careful attention from the collector.

Assembly procedure for quick release chuck

Assembly is carried out on a clean surface. Parts are pre-washed, dried and greased with a thin layer of recommended grease.

The gearbox shaft is lubricated with Makita 183477-5 SDS-PLUS grease. On the shaft in a certain sequence, all incoming parts of the cartridge are collected.

After installing the conical spring, pos.6, put on the guide washer pos.5 and fix it with the ball pos.20, inserting it into the groove of the gearbox shaft.

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It remains to put on the ring pos. 4, the casing of the coupling pos. 3, fix the parts with the locking ring pos. 2. At the last stage, insert the protective tip pos. 1 into the end face of the cartridge
The Makita 2450 rotary hammer cartridge repair is now complete. It remains to check its quality by inserting a drill into the cartridge. With proper assembly, the cartridge holds the drill from spontaneous loss.
Cartridge assembled.

Disassemble the gearbox

To get to the mechanical part, you will need to remove the plastic case.

The procedure for dismantling the mechanical part of the Makita rotary hammer
The protective black plastic case is first removed. The case is removed after you unscrew the four screws securing the case from the end.
By pushing on the shaft end you squeeze the gearbox out of the housing.

After removing the housing, it is necessary to separate the rotor from the gearbox. A reducer is a general mechanical part.
The rotor is separated from the mechanical part (gear) simply.
With your right hand you need to hold the gearbox, hold the rotor with your left.
Swinging, pull both sides in opposite directions. The rotor is held in the gearbox due to the friction of helical gears.
The main malfunctions of the Makita rotary hammer occur in the mechanical part of the tool.

The most characteristic malfunction for the mechanical part, the failure of the shock mechanism.

Dismantling the hammer
The shock mechanism is assembled on the inner case and consists of a gear shaft and an intermediate shaft.
Rotational motion is transmitted through helical gears to the countershaft.

The gear shaft is a hollow barrel in which the cylinder moves freely.

A small spur gear mounted on an intermediate shaft transmits rotation to a large spur gear of the gearbox shaft in which the percussion mechanism is mounted.
And the translational movements on the gearbox shaft of the shock mechanism are simultaneously transmitted due to the transfer from the rolling bearing of the intermediate shaft to the cylinder moving in the gearbox barrel.

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We proceed to disassemble the intermediate shaft.

Dismantling the countershaft

On the shaft pos. 40, a helical gear pos. 42 is mounted, on which rotation is transmitted from the rotor gear, a rolling bearing 608zz pos. 41, which transmits translational motion to the joint pos. 34 of the piston pos. 32.
On the other side of the shaft, a clutch pos.39, spur gear 10 pos.80, compression spring pos.38, snap ring S-7 pos.37, bearing 606zz pos.36
Particular attention should be paid to the condition of the rolling bearings.
The punch has imported bearings. Allowed the installation of domestic bearings.
Bearing 606zz can be replaced with 80016, bearing 609zz is changed to 80019.

We proceed to disassemble the shaft of the shock mechanic

Dismantling the shock shaft

Dismantling the barrel of a Makita 2470 rotary hammer is a simple process using the Makita rotary hammer design.
The shaft is a barrel pos.21, in which the shock mechanism is assembled.
A gear pos.19 is attached to the barrel, which is pressed by the spring pos.18, through the washer pos.17 and fixed by the locking ring pos.16.

The cylinder pos. 32 moves in the barrel, acting on the striker pos24. On the reverse side of the striker is fixed a metal ring pos. 27, transmitting the blow to the drill.
And when do you need to replace the barrel of a punch?

Most often, a metal ring fails.

Drum cylinder

With the disassembly, we figured it out.
We change the parts to serviceable and are preparing to assemble. Learn more about grease and punch assembly.

Read if there are problems with the electric part of the punch.

Makita rotary hammer quick release video

Video: disassembling the punch makita HR2450 5 minutes before m

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