Hammers Hitachi - Fault finding and repair

At first glance, repairs perforator Hitachi DH24 with their hands may seem difficult, but read the scheme punch andinstructions for disassembling the gun DH24PC3.Perforator Hitachi Hitachi DH24PC3 is a fairly simple design that does not require special knowledge to perform the repair, only need the appropriate tool.The only requirement to perform the assembly and disassembly of the punch in sequence.

Structurally Hitachi hammer drill made by the block diagram.The structure of the tool includes a mechanical unit, the stator unit and control circuits.

Faults mechanical perforator Hitachi DH24PC3

Hammers Hitachi represent a reliable tool, easy to operate, are in high demand among professionals and among the Russian masters and lovers of tinkering with his own hands.

But any time is operated with the tool requires no maintenance, periodic inspection and, if necessary, repair.

Any punch found three main types of faults:

• failure, in which the punch drills, but not hammer;
• failure, in which the punch hammer, but not the drill;
• failure in which no punch hammer and drill.

Faults in which the punch drills, but not hammer

drilling process in Hitachi rotary hammers provided by transmitting torque from the rotor through the intermediate shaft to the impact mechanism shaft.

chipping process is ensured by converting the torque of the intermediate shaft in a reciprocating through the rolling bearing, called by the people "drunk bearing."

shock pulse is created by moving the striker in the trunk liner and piston shock mechanism.Drunk bearing fixed on the intermediate shaft converts the rotating motion into reciprocating.

the reasons that can drill hammer, but do not hammer can be:

• drunken destruction of the bearing;
• destruction trunk piston sleeve;
• seizure or destruction of the strikers;
• cranking clutch bearing drunk;
• wear rubber O-rings.

With the destruction of drunken bearing becomes impossible transformation torque in reciprocating impulse.But at the same time, the rotation of the barrel is transmitted by gears.More detailed instructions for disassembling the gun Hitachi.

Repair drunken bearing and clutch or replacement

Out drunken bearing failure occurs when the destruction of the bearing cage built.This fault is corrected only full replacement drunken bearing.The perforator Hitachi DH24PC3 a bearing article 324533. Russian analogue of this bearing is not present, but the bearings are manufactured in China, good quality.

To replace the rolling bearing is necessary to remove the intermediate shaft from the inner body puncher.

Dismantling drunken bearing is made in conjunction with the clutch.Ruined drunk poz.53 bearing can not be restored, but the clutch poz.52 with a slight worn splines engagement can be restored.

Repair or replacement of the piston sleeve

Loss of impact can occur during the destruction of the piston sleeve poz.39.At the piston sleeve can fall off the mounting lugs of the piston pin poz.42.In the liner collapses piston skirt, a thin part of the piston.There are cases that the sleeve bites striker firing mechanism poz.37.

With the destruction of parts of the piston sleeve made its complete replacement.Repair the piston sleeve is almost impossible.

Repair striker firing mechanism

in the trunk of impactor used two types of strikers.The striker poz.37 cylinder liner impact mechanism and the striker poz.29 barrel.

rubber ring is installed on key striker poz.37.38 and mounted on the striker poz.29 rubber ring poz.30.rubber and oil seal poz.32.

In addition, the firing pin holder set poz.29 poz.31 impact mechanism, both sides of which the O-rings are put poz.30, 32. Then, the firing pin mounted damper poz.35 holder, which is fixed a lock ring poz.36.Poz.34 - a rubber sealing packing.

main failure of the strikers is their wear, the wear of the sealing rings in the process of shocks.The striker can bend, flatten.

Failures of this kind are removed replacement parts shock mechanism and mandatory replacement of the rubber O-rings.

to buy new spare parts, it is necessary to know the details of the ordered articles, which are specified in the above photograph.

Repairing intermediate shaft clutch

When the hammer in the "Punch" did not try to press hard on the tool.

to lacks shock pulse leads slip clutch key 51 on the intermediate shaft poz.52.

We clutch at the hard work licking their teeth.This occurs at an elevated pressure in the working tool during the execution of works or the weakening of the spring pressure force on clutch poz.50.

Restore tooth profile is possible by means of needle files.If the tooth is not strong lick, the needle files round tooth profile corrected by reduction of its corners on the clutch and the intermediate shaft poz.52.Otherwise, it should be replaced with a strong wear.

replacement rubber O-rings

The shock pulse circuit providing a mechanism used by several sealing rings.

Loss shock pulse on your body is due to abrasion of the O-rings.A problem occurs gradually as the wear of the seals.

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Faults in which the punch hammer, but not drill

Slotting perforator Hitachi DH24PC3 is due to the transfer of reciprocating motion of the intermediate shaft through the rolling bearing on the cylindermoving the barrel to the impact mechanism.The punch cylinder is equipped with two striker.That movement of the striker and transmits the impact impulse on the table, in the keyless chuck which is inserted into a working tool such as a drill.

drilling process in Hitachi DH24 rotary hammers provided by transmitting torque from the rotor through the intermediate shaft to the impact mechanism shaft.At the end of the barrel mounted keyless chuck, which is installed and working tool.

poz.62 Helical rotor gear transmits torque to the helical gear of greater diameter poz.54 fixed to the intermediate shaft poz.51.The rotating intermediate shaft transmits its small spur gear torque on a large spur gear poz.25 fixed to the striking mechanism barrel.

Drilling in perforator Hitachi DH24 is due to the rotation of the keyless chuck, which is enshrined in the drill or drill.

malfunctions of this kind results:

- cranking poz.49 gear on the intermediate shaft poz.52;

- cranking gears poz.25 on poz.24 barrel shaft.

gear inspection on

Gear poz.49 intermediate shaft can rotate on the intermediate shaft poz.52 due to weakening of the pressing force of the spring and poz.50 malfunction poz.48 mode switch.

This fault Punch Hitachi eliminated by reduction of the splines on the pinion 5 and the shaft.

Restore slots with a slight deterioration may be using the correction form tooth slot.To do this, using a round needle file, clamped in the drill chuck, to fix the tooth contours.

Restore Mode switch 4 can only complete its replacement.

Repair barrel pinion shaft impact mechanism

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

With the weakening of the forces of the spring poz.26 gear comes out of engagement and rotated.

troubleshoot this kind of replacement springs and correction forms of engagement of the teeth.

Faults electrical

When a fault in the electrical part of the punch tool stops working completely.

Faults in which no punch drills and hammer

For reasons that punch stops working, include:

• destruction of teeth small helical rotor gears;
• failure of the rotor;
• short circuit or open circuit in the stator;
• open or short circuit in the control circuits.

rotor repair

With little worn spur gear failure is eliminated by reduction of tooth form, if possible.Otherwise, the gearbox must be replaced completely.

If a short circuit or open rotor windings failure lamella collector, the gearbox can be repaired with his own hands or replaced.New is quite expensive.And to make the rotor with your hands is not everyone's strength.The choice is yours.For information on how to make the rotor with your hands, you can read here.

Stator Repair

Repair stator is made in the case of detection of a short circuit or an open.Repair the stator is not difficult if you know the number of turns, wire size and brand.

If you have burned the stator, or it detects an open, when you attempt to make disassembly counting the number of turns and measure the cross section of a micrometer.Note the percentage fill of stator winding slots.When filling small percentage can increase the diameter of the winding wire.

Inspection of the electrical control

Of faults in control circuits is most often manifested in the power cord breakage in the input position in the tool and the failure of the start button.

The instrument features a combined switch, allows you to run the punch and adjust the frequency speed.The punch-button switch is used 220 (OLD 331454/324536).

carbon brushes poz.74, 77 are fixed in special holders poz.75.short-circuit control circuit can be caused poz.69 choke and a diode contact poz.72.It is important to monitor the size of the brush and replace them in time.

The article describes the main types of faults in rotary hammers Hitachi DH24PC3.If you are faced with other faults, or know how to fix them, please contact us.

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