Why The Hammer Drill Stopped Hammering But Drills
How to repair a punch if it stopped working We find out the reasons why the punch does not work; we consider different situations, the essence of breakdowns and how to eliminate them with our own hands. Why does the tool heat up, a smell appears, slips, hammers, but does not drill. Many other questions can be solved on their own without resorting to the help of a wizard.
Oil flows from the punch
Leakage is a direct indicator of wear on certain parts inside the mechanism. Unscrew the model and make diagnostics, change the lubricant if necessary.
The hammer drill slips
The reason for this is a loose coupling. It is enough to tighten it or replace it.
Barrel hammer repair
This procedure is no different from repairing a conventional rock drill. It is worth considering that the motor and shaft are located vertically.
Impact drilling mode (drilling)
First you need to switch the hammer drill to hammer drilling mode. In this case, the toggle switch is installed above the mark with the image of the drill and hammer. After that, the drill must be positioned where it is necessary to make a hole, and then turn on the tool.
During drilling, you need to try not to skew the drill, not allowing it to slide from the desired point. The hammer drill must be held firmly, but do not put pressure on it. Light pressure gives optimal results.
When filling the hole with crumbs and dust, try to empty the drill out to clear the debris. This will facilitate further work.
When drilling in concrete, the drill bit may bump into the reinforcement. In order not to lose control of the tool, you need to consider this possibility even before starting work and immediately take a comfortable position, securely holding the drill.
- Brief description of perforators
- How to prepare a hammer drill for work
- How to work with a punch in different modes
- Drilling mode
- Impact drilling mode (drilling)
- Impact mode
- Techniques for working correctly with a punch
- Rotary hammer care and operation
- When you can “make noise” with a puncher
The tool must first be switched to drilling mode without impact. The toggle switch is installed opposite the mark, which looks like a drill. After that, you need to place the drill in the right place and turn on the tool using the button. When drilling, you do not need to press hard on the drill, the pressure on it should not be more than five kilograms.
When using drill chucks, do not use the counterclockwise and impact drilling positions, as this could damage the chuck and cause it to separate from the power tool. To prevent such a situation, the hammer drill has been added with the “impact blocking” function, designed for drilling various holes in wood or metal.
Before the actual operation of the tool, it is necessary to check the mode in which it is located. The rock drill should be idling for about one minute. Pay attention to the operation of the gearbox. There should be no extraneous noise, vibration and knocking. The smells of burning or the appearance of smoke should also alert. They can appear in the event of a malfunction of the power tool.
The force of the conical spring pressing the clutch has weakened
When the spring pressure (pos. 50) decreases, the clutch slips on the intermediate shaft, without transferring rotation from the small spur gear to the large gear (pos. 22) of the barrel shaft, pos. 821, of the impact mechanism. By the way, the clutches are arranged differently on different Bosch models.
The hammer drill stops hammering, but drills
The hammer drill does not hammer under load or idle for the following reasons:
- The rubber rings of the striker, striker, piston are worn out;
- Collapsed roller bearing race;
- The cylinder collapsed, the firing pin of the percussion mechanism barrel;
- Cut the splines of the clutch mounted on the intermediate shaft;
Consider the options in which the hammer drill drills, but does not hammer
Causes of breakage of the punch
The principle of the hammer hammer mechanism.
If the punch stops working, the reasons may be as follows:
- Malfunction of the crank mechanism;
- Development of the intermediate shaft;
- Lack of lubrication;
- Wear of the clamping unit;
- Mechanical damage to striking elements (firing pin or clutch).
The perforator must be lubricated periodically, applying a special material instead of the traditional Litol. Saving on tooling leads to intensive wear of the bore, which houses the bit / drill liner.
The hammer drill does not hit after a significant amount of lubricant has escaped from the gearbox when the oil seals and rings are worn. Rubber parts work in aggressive environments, extreme conditions. With a significant accumulation of dust and crumbs on their surface, the material loses its elasticity, bursts, cracks from stress.
Diagram of the device components of the perforator
Violation of operating modes is dangerous for a hammer drill:
- Inexperienced users put excessive pressure on the body in the hammer mode, forgetting that the bit works due to the force of the internal mechanism, the amplitude of the striker stroke decreases, leading to its breakage;
- A change in the bit trajectory with a certain deepening of the working body into the destroyed material leads to wear of the piston, striker, bearings, and crank assembly;
- Overheating of the tool during prolonged use in difficult conditions is fraught with shearing of the gear teeth.
A hammer drill is often used for chipping ceilings, which increases the amount of dust in the spindle. Outer boots are not able to protect the inner parts from abrasive penetration. Tools from two or three manufacturers are equipped with internal anthers (for example, the Kress PK450HM model), so a periodic inspection and cleaning of the clamping unit is required.
The power tool can work in drilling mode without a hammer, but not vice versa. If the rotation unit is damaged, slotting becomes impossible, since the internal mechanisms are jammed. In this case, urgent repairs will cost ½. ¾ the cost of a new tool, which is economically unprofitable for the user.
What to do if the hammer drill stops hammering smoothly
If the hammer drill has stopped hammering, the feasibility of repair should be assessed. It is pointless to restore imitations of popular brands, cheap modifications. They are not designed for a long service life, the cost of repair is close to buying a new power tool. Models of famous brands last longer, their replacement is often caused by the appearance of modifications with additional features, obsolescence.
Lack of prophylaxis after 100-80 hours of operation will inevitably lead to failure of the hammer drill.
Rotary hammer malfunctions
After the tool stopped working, many users try to eliminate the cause on their own to save time. Doing this is strongly discouraged, since the industry produces several types of rock drills:
Figure 2. Stages of rock drill lubrication.
- Electromagnetic. The peak beats in them due to the reciprocating movement of the core inside the coils;
- Electro-pneumatic. The clutch assembly transmits the impact through the air cushion to the flying piston through the impact piston.
The impact energy in the second case is five times greater, reaching 1.5 kW. Fatigue damage begins in broken shanks of parts over time, therefore, despite the air cushion, the pistons require periodic replacement. Fig. 1
There are straight, L-shaped tool bodies. The former are designed for confined spaces (niches, narrow slots), the latter are intended for the destruction of materials in the immediate vicinity of the working body. Cooling of engines of L-shaped models is much more efficient, therefore their resource exceeds direct modifications by one and a half times. Professional rotary hammers are equipped with powerful electric motors, often have an L-shaped body, much heavier than household counterparts. They are equipped with compensators that reduce vibrations on the tool body, electronic protection systems against overheating, speed control (for drilling mode), improved ventilation systems, button locks.