Dismantling the Makita 24 70 Hammer
A hammer drill is a percussion drilling tool that simultaneously performs the function of percussion and drilling equipment when working with extremely durable materials.
The device uses two ideas at the same time: the tool rotates and moves in the longitudinal direction, transmitting the impulse of impact to a solid surface.
Hammers always operate in extreme environments with a high degree of dust.
The uptime is affected not only by the operating conditions, but also by the quality of the components included in the tool.
To perform maintenance on Makita 2450, 2470 rotary hammers, it is imperative to familiarize yourself with the internal contents of the tools that make up the components. This manual will help you find out the weaknesses of the Makita punch.
To carry out repairs of the Makita 2450, 2470 rotary hammer, a person who owns locksmithing skills and has knowledge of electrical engineering is allowed to do it himself.
Remember! When repairing a rotary hammer, it is necessary to comply with safety regulations when working with electrical appliances.
Makita 2450 and 2470 rotary hammers are assembled almost in the same way and practically from the same, interchangeable parts. Repairing them is no different.
General view of the Makita 2450 rotary hammer
For ease of repair, the assembly diagram and catalog of parts for Makita rotary hammers are given below.
Makita 2450 rotary hammer assembly diagram
The device of Makita 2450 and 2470 punchers
The Makita punch conditionally consists of electrical and mechanical parts. Over, in the black plastic case there is a mechanical assembly of the punch, and under the green plastic case the electric part of the punch is hidden.
The procedure for disassembling the mechanical part of the punch
The mechanical assembly is designed to transmit the rotational moment of the shaft to the tool, creating not only torque and translational impact impulse.
The task of the mechanical assembly is to transmit rotation from the rotor to the tool, while providing the tool with longitudinal movement.
Disassembly of the punch begins with the removal of the quick-detachable cartridge.
Quick Release Chuck Parts
Having disassembled the cartridge, unscrew the four screws pos. 10 that fasten the gear housing cover pos. 14 of the mechanical unit and the punch body and, pressing on the end of the punch shaft, remove the black plastic cover.
Dismantling the Makita 24 70 Hammer
Remove the cover of the mechanical unit
To remove the mechanical block from the green stator housing, you must:
- 1. Unscrew the three screws pos. 70,75,76 holding the cover pos. 69 in the handle of the punch;
- 2. Remove the cover;
- 3. After releasing the springs of the brush holders pos.63.66, remove the carbon brushes pos.65.
Now you can pull out the mechanical block from the stator housing.
Type of mechanical block
Having released the mechanical unit, it is necessary to disconnect the rotor from it. Rotor pos. Fastens in the mechanical block due to friction of gear teeth and is pulled out by staggering and disconnecting at the same time.
Dismantling the mechanical block of the shock assembly
The mechanical assembly is assembled on the inner case, item 49. To remove the intermediate shaft, unscrew the two screws pos. 43 at the base of the housing. Another intermediate shaft is fixed by the lever of the mode switch.
Two words about the mode switch
In Makita 2450, 2470 rotary hammers the lever which provides the tool with three operating modes is installed. The hammer drill can simply drill, simply hammer, and hammer while drilling. The switch lever is worn on the axis of the inner case and is fixed by the compression spring pos. 85, the washer pos. 87 and the lock ring pos. 86.
It’s time to remove the countershaft.
Dismantling the countershaft
To disassemble the countershaft, use the diagram attached to this manual.
Photo of the intermediate shaft circuit showing the disassembly order
From the shaft pos. 40, remove in order:
- A). Bearing pos. 46 and ring pos. 47;
- B) spur gear pos. 42;
- In). Rolling bearing pos.41;
And on the other side of the shaft, remove:
- D). Flat washer 12 pos. 35;
- E). Bearing 606 pos.36;
- E). Snap ring S-7 pos 37;
- G). Compression spring 7 pos. 38;
- H). Clutch pos. 39.
The procedure for disassembling the shaft of the barrel of the percussion mechanism
To disassemble the shaft of the percussion mechanism, it is necessary to pull it out of the inner case.
From the shaft, pull out the cylinder pos. 32, inserted into the internal cavity of the shaft.
The cylinder is disassembled very simply:
- 1. From it you need to get the drummer pos.30;
- 2. The piston hinge pos.34 is knocked out;
- 3. Two flat washers pos.33.35 are removed.
To disassemble the shaft itself pos. 21 of the shock mechanism, it is necessary to remove from the side of the cartridge installation shaft:
- – annular spring 28 pos.16;
- – the puck 30 pos.17;
- – compression spring 31 pos. 18;
- – spur gear 51 pos.19;
- – steel ball 7.0 pos. 20.
And from the side of the inner cavity of the shaft it is necessary to remove:
- – annular spring 28 pos. 29;
- – rubber ring pos. 28;
- – metal ring pos. 27;
- – rubber ring 15 pos. 26;
- – ring 9 pos. 25;
- – a flat metal washer 28 pos.22.
Disassembled shaft shaft
Dismantling the electrical part of the Makita 2450, 2470 rotary hammer
The electric part of the Makita 2450.2470 rotary hammer includes:
- Rotor pos. 54;
- stator pos. 59;
- TG813TLB-1 switch pos. 68;
- carbon brushes SV-419 pos.65;
- brush holder pos.63.66.
To remove the stator, it is enough to knock on the end of the plastic green case on the side of the stator with a wooden mallet or bar.
But first you need to unscrew the two self-tapping screws 4 × 60 mm pos. 57.
With frequent tapping on the housing, the stator spontaneously protrudes beyond the edges of the housing, and then it is removed by hand.
The remaining elements of the electrical part of the Makita 2450 or 2470 rotary hammer are easy to dismantle because they are not fastened.