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Repair Parts Home  Power Tool Parts  Hitachi Parts  999-073 Carbon Brush Set

Carbon Brush Set

Part Number: 999-073
Hitachi
Availability: 17 in stock
Price: $17.40
Quantity:
Order within the next 5 hours
and your part ships today!

*This part replaces obsolete part #: and 981-612Z.

Description:
Set of 2 Carbon Brushes with wire leads and brush springs attached. The set contains genuine Hitachi replacement parts.
This brush set will fit the Hitachi tools listed at the bottom of the page.
• Worn brushes frequently are the cause behind a motor running poorly.
• Replacing brushes can fix a motor that’s operating intermittently.
• New brushes can restore a motor’s electric braking.


Carbon brushes are one of the most commonly replaced power tool parts. This is because carbon brushes are wear items, meaning that through friction and use they will gradually wear away until they need replacing. Worn brushes are a common causes of intermittent motor function, reduced electric braking and reduced motor power. A worn-out brush will often be worn down near to the wire lead and can be cracked, pitted, or burned. When replacing carbon brushes, be sure to inspect your armature for burns, cracks, or other damage which can indicate larger motor problems.

This Brush will pop out a pin when the Brush wears to a certain length.
It is advised to keep an extra set of these brushes on hand at all times

Product Information
Manufacturer: Hitachi
Product Number: 999-073
Classification: Part
Weight: 0.03 lbs.
Shipping: Ships Worldwide
Products Compatibility

This item works with the following types of products:

  • • Demolition Hammer
  • • Drill
  • • Hammer Drill
  • • Polisher
  • • Reciprocating Saw
  • • Rotary Hammer
  • • Sander
  • • Saw
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Questions & Answers

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Repair Instructions: Submitted by Customers Like You
1 of 1 people found this instruction helpful
Tool Type:
Rotary Hammer
Parts Used:
Carbon Brush Set - 999-073
Repair Difficulty:
Easy
Time Spent Repairing:
Less than 15 minutes
Tools Used:
Screwdriver, Pliers
Brushes were worn out.
Removed the covers from brushes and removed the brushes with needle nose pliers. Installed the new brushes and replaced the covers. Works like a brand new machine.
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Tool Type:
Demolition Hammer
Parts Used:
O-Ring (S-25) - 319-572
Carbon Brush Set - 999-073
O-Ring (I.D 27.2) - 325-297
Connecting Rod - 326-385
Grease For Hammer.Hammer Drill (70G) - 308471
Retaining Ring For D10 Shaft 10 Pcs. - 939540
Repair Difficulty:
Medium
Time Spent Repairing:
1-2 hours
Tools Used:
Screwdriver, Pliers, Nutdriver, Lock ring pliers, snap ring pliers
Would not hammer
Watched U tube videos. Guy in Europe repairs tools and makes great videos. Got parts breakdown drawing from Mfr website. Broke down tools, found broke parts, ordered all needed from eReplacementParts and put tools back together according to video. Tools broke due to user not following recommended maintenance of grease every 6-months.
Note: lock ring pliers are not the same as snap ring, and really help with this tool.
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Tool Type:
Hammer Drill
Parts Used:
Carbon Brush Set - 999-073
Side Handle - 981870
Handle Holder - 981-960
Handle Bolt - 971-785
Spring - 672-612
Repair Difficulty:
Medium
Time Spent Repairing:
1-2 hours
Tools Used:
Screwdriver, Wrench Set, Nutdriver, Bearing puller, brass drifts, lathe
Stopped working. Rotor was worn, brushes shot, brush holders shot.
Took Hitachi hammer motor and switch assembly apart. Determined parts needed. Removed the bearings. Spun the rotor in the lathe to recondition the brush contact area. Installed the new bearings and installed the rotor in the new motor housing. Installed the new brushes and reassembled. Also, installed the new cord. Parts also included the new motor housing and the bearings. Much cheaper than a new hammer and works excellent. Parts delivered quickly.
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Tool Type:
Demolition Hammer
Parts Used:
Cord Armor D10.7 - 940778
Carbon Brush Set - 999-073
Cord - 500434Z
Repair Difficulty:
Easy
Time Spent Repairing:
15-30 minutes
Tools Used:
Screwdriver, Pliers, Allen wrench
Needed cord and brushes
Remove the screws from the back handle
Removed the cord clamp
Remove the old cord wires from the switch
Slid the cord protector on the new cord
Connected the new cord wires to the switch
Screwed on the cord clamp
Screwed on the back handle
Removed the brush caps
Removed the old brushes
Installed the new brushes
Installed the brush caps
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Tool Type:
Hammer Drill
Parts Used:
Carbon Brush Set - 999-073
Repair Difficulty:
Easy
Time Spent Repairing:
15-30 minutes
Tools Used:
Screwdriver
Worn brushes
Used a screwdriver to remove the brush caps. Then I removed the used and worn brushes and discarded them. I then installed the new brushes into the brush holders, then screwed the brush caps back on.
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Tool Type:
Rotary Hammer
Parts Used:
Carbon Brush Set - 999-073
Repair Difficulty:
Easy
Time Spent Repairing:
Less than 15 minutes
Tools Used:
Screwdriver, Knife
One of the brushes overheated causing the drill motor to stop running
1. Removed the old brushes (had to trim the green drill body with a knife to be able to remove
the metal brush covers.)
2. Installed the new brushes after inspecting the brush holders (brush holders were ok)
3. Reinstalled the metal brush covers, one phillips screw each.
4. Tested drill,worked perfectly
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0 of 1 people found this instruction helpful
Tool Type:
Hammer Drill
Parts Used:
Carbon Brush Set - 999-073
Switch (A) (1 P Screw Type) W/o Lock - 992-891
Repair Difficulty:
Medium
Time Spent Repairing:
1-2 hours
Tools Used:
Screwdriver, Pliers
Old hammer drill had no power.
Replace the switch and brushes, now it's like new.
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Discussion
Discussion for Carbon Brush Set - ( 999-073 )
Discussion is closed. To ask our experts a question about a part, use the Q&A feature.
Question: I Just Change The Brushes

Jamesjohn

The new brushes are the same size as the existing ones.

When i try the tool it worked well for a few moments then i started smelling electrical burning and the tool slowed. not good.

without knowing the inside of the tool I am not sure what it might be. I hope not an armature.

What is your suggestion for the next thing to look at?

last weekend i lost the uses of both of my rotary hammers. ouch.
Electrical smell + slowing of motor = big problem

I'd remove the armature and inspect the commutator bars for burns and damage.
If they are damaged, the armature can 'sometimes' just be replaced and the problem solved. But.,.. often when the armature shorts out it will cause damage to the field, causing it to need replacement also.
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