Hitachi perforators - troubleshooting and repair

At first glance, the repair of the Hitachi DH24 perforator with your own hands may seem complicated, but familiar with the perforator circuit and the Hitachi DH24PC3.Perforator HitachiDH24PC3 is a fairly simple design that does not require special knowledge for repair, only the appropriate tool is required. The only requirement is to disassemble and assemble the puncher in a certain sequence.

The Hitachi perforator is structured in a block diagram. The tool includes a mechanical block, a stator block and a control circuit unit.

Malfunctions of the mechanical part of the perforator Hitachi DH24PC3

Hitachi perforators are a reliable tool, easy to use, highly sought after by professionals and among Russian craftsmen and craftsmen.

But any maintenance tool will require maintenance, periodic inspection and, if necessary, repair.

Any puncher has three main types of malfunctions:

• malfunctions, in which the perforator drills, but does not;
• malfunctions, in which the punch drills, but does not drill;
• malfunctions, in which the puncher does not drill or drill.

Malfunctions in which a drill drills, but does not groove

The drilling process in Hitachi drills is provided by transferring the rotational torque from the rotor, through the intermediate shaft to the barrel of the impactor.

The dollying process is provided by converting the rotational moment of the intermediate shaft into a reciprocating one through the rolling bearing, called the "drunk bearing" in the people.

A shock pulse is created by moving the strikers in the piston sleeve and the barrel of the impactor. A drunken bearing fixed to the axis of the intermediate shaft converts the rotational motion into a reciprocating motion.

The reasons why a perforator can drill, but do not break, can be:

• destruction of a drunken bearing;
• destruction of the barrel of the barrel;
• jamming or destruction of strikers;
• cranking the clutch in a drunken bearing;
• wear of rubber sealing rings.

With the destruction of a drunken bearing, it becomes impossible to convert the torque into a reciprocating impulse. But at the same time, the rotation on the barrel is transmitted due to gears. More complete instructions for dismantling the perforator Hitachi.

Repair of a drunken bearing and a clutch or their replacement

The output of a drunken bearing is damaged when the cage of the built-in bearing collapses. This fault is only removed by completely replacing the drunk bearing. The Hitachi DH24PC3 is equipped with an articulated bearing 324533. There is no Russian analogue to this bearing, but bearings of Chinese production are produced, good in quality.

To replace the rolling element bearing, it is necessary to remove the intermediate shaft from the inner casing of the perforator.

Dismantling of the drunk bearing is performed in conjunction with the clutch. The destroyed drunk bearing pos. 53 can not be restored, but the coupling clutch pos. 52 with minor wear of the splines can be restored.

Repair or replacement of the piston sleeve

Impact loss may occur when the piston sleeve pos. 39 is destroyed. The piston pin liner can fall off positively. The skirt of the piston, the thin part of the piston, is destroyed. There are cases when a hammer of the impact mechanism poses in the sleeve.

When the parts of the piston sleeve are destroyed, it is completely replaced. It is almost impossible to repair the piston sleeve.

Repair of impact strikers

Two types of strikers are used in the barrel of the impactor. Striker pos.37 cylinder liner hammer mechanism and barrel pegs pos.29.

A rubber ring pos.38, and on the pegs poz.29 mounted rubber ring pos.30.and a rubber oil seal pos.32.

In addition, the hammer holder pos. 31 is installed at the pivots of pos. 29, pos. 30, 32 on both sides of which are sealed rings. Then the dampener holder pos. 35 is mounted on the side, which is fixed by the locking ring pos.36.Pos.34 is a rubber sealing gland.

The main breakdown of the strikers is their wear and tear, wear of the sealing rings in the process of impact loads. The firing pin may bend, flatten out.

Breakages of this kind are eliminated by replacing the parts of the impactor and the mandatory replacement of all rubber sealing rings.

In order to purchase new spare parts, you need to know the parts of the parts ordered, which are indicated in the pictures shown.

Repair of the clutch of the intermediate shaft

When operating the perforator in the "Impact" mode, do not try to press the tool heavily.

The slippage of the clutch clutch pos 51 on the intermediate shaft pos.52 leads to the loss of the shock pulse.

The teeth of the clutch are tightened during hard work. This occurs at increased pressure on the working tool during the execution of work or the weakening of the force of the spring pressure, pos. 50, on the clutch.

You can restore the profile of the tooth with the help of a file. If the tooth is not licked strongly, then the round profile of the tooth is corrected by restoring its angles on the clutch and on the shaft of the intermediate pos.52.Otherwise, if it is heavily worn, replace it.

Replacing rubber O-rings

Several O-rings are used in the shock-impulse mechanism circuit.

Impact of the impact pulse on the working member is due to the wear of the O-rings. The fault appears gradually, as the seals are worn.

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Faults in which the puncher chops, but does not drill

The chopping of the Hitachi DH24PC3 is due to the transfer of reciprocating motion from the intermediate shaft through the rolling bearing to the cylinder moving in the barrel of the impactor. Two pincers are installed in the cylinder of the puncher. Here is the displacement of the striker and transmits the shock pulse to the table, in the quick-clamping chuck of which, a working tool is inserted, for example, a drill.

The drilling process in the Hitachi DH24 is provided by transferring the rotational torque from the rotor, through the intermediate shaft to the barrel of the impactor. At the end of the barrel a quick-action chuck is fixed, into which the working tool is mounted.

The helical gear of the rotor pos 62 transmits the rotational moment to the helical gear of larger diameter pos. 54, fixed to the intermediate shaft pos.51.The rotating intermediate shaft transmits its rotational torque to a large spur gear, pos. 25, fixed to the barrel of the impactor with its small straight-toothed gear.

Drilling in the Hitachi DH24 rotary hammer is due to the rotation of the quick-action chuck in which a drill or drill is fixed.

For faults of this kind it leads:

- turning the pinion pos. 49 on the intermediate shaft pos.52;

- turning of a gear wheel pos25 on a shaft of a trunk pos.24.

Inspection of the pinion on the intermediate shaft

The pinion of pos. 49 can be rotated on the intermediate shaft pos.52 due to the weakening of the spring pressing force of pos. 50 and the incorrect operation of the mode switch pos.48.

This fault of the Hitachi Hammer is eliminated by the restoration of the splines on the pinion 5 and the shaft.

To restore the splines with little wear, you can fix the shape of the tooth slot. To do this, you need to fix the contours of the tooth with the help of a round nail file, clamped in the cartridge of the drill.

It is possible to restore the operation of the mode switch 4 only by completely replacing it.

Repair of pinion shaft shaft of impactor

Gear pos.25 is mounted on the table shaft and fixed there using a spring pos.26, fixed by a lock ring pos.28 and washer steel M30 pos.27.

With the weakening force of the spring pos.26 the gear jumps out of gearing and turns.

The failure of this type of spring replacement is corrected and the shape of the gear teeth is corrected.

Electrical faults of the

When the malfunction occurs in the electrical part of the gun, the tool stops working completely.

Malfunctions in which the punch drill does not drill and do not bite

The reasons for which the puncher stops working are:

• tooth decay of the small helical gear of the rotor;
• rotor failure;
• short circuit or an open in the stator circuits;
• open or short in control circuits.

Rotor Repair

With minor wear of the helical gear, the fault is eliminated by restoring the tooth shape, if possible. Otherwise, the gear unit must be replaced completely.

In case of short circuit or breakage of the rotor windings, failure of the collector lamellas, the reducer can be repaired by one's own hands or replaced with a new one. The new one is quite expensive. And not everyone can make a rotor with their own hands. The choice is yours. How to make a rotor with your own hands, you can read here.

Stator repair

The stator is repaired if there is a short circuit or an open in it. Repair the stator is not difficult, if you know the number of turns, wire cross section and its brand.

If you have a stator burned, or if a break is detected in it, then during its disassembly, count the number of turns and measure the cross section with a micrometer. Pay attention to the percentage of filling the stator with the winding. With a small percentage of filling, the diameter of the winding wire can be increased.

Inspection of the electrical control part

Faults in the control circuits are most often manifested in the breakage of the power wires at the point of entry into the tool and the failure of the start button.

The instrument uses a combined switch to start the punch and adjust the speed. In the puncher, a button switch 220 V( OLD 331454/324536) is used.

Carbon brushes pos.74, 77 are fixed in special holders pos.75.The reason for the short-circuiting of the control circuits can be a throttle post 69 and a diode contact pos.72.It is important to monitor the size of the brush and replace them in time.

The article presents the main types of malfunctions in Hitachi DH24PC3 rotary hammers. If you encounter other problems or you know how to fix them, write to us.

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