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Carbon Brush Set

Part Number: 999-073

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Repair Instructions

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

Product Information

Manufacturer: Hitachi

Product Number: 999-073

Classification: Part

Weight: 0.03 lbs.

Shipping: Ships Worldwide

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

Warning: California's Proposition 65

Compatibility

This part is compatible with the following machines:

Hitachi

H45FRV 3/4" Hex Demolition Hammer
H45MRY SDS Max Low Vibration Demolition Hammer
D13 1/2" 6.2 Amp Reversible Drill
DH40FR 1-9/16" Spline Shank Rotary Hammer
DH40MRY 1-9/16" SDS Max UVP Rotary Hammer
DH30PC2 1-3/16" SDS+ Rotary Hammer
DH40FA Hammer Drill
DH40FA Hammer Drill
H45MR SDS Max Shank Demolition Hammer
DH40MR 1-9/16" SDS Max Rotary Hammer
DH30PC 1-3/16" VSR SDS-Plus Rotary Hammer
DH38YE 1-1/2" Rotary Hammer, 2-Mode, Spline Shank
CR12V Reciprocating Saw
CR12V Reciprocating Saw
D13Y 1/2" Right Angle Drill 6.2A
D13YA 1/2" Angle Drill
DH30PB SDS+ 1-3/16" 2 Rotary Hammer VSR

DH38YA SPLINE 1/2" Rotary Hammer
DH38YF SPLINE 1/2" Rotary Hammer
DH40FB SPLINE 1-9/16" Rotary Hammer
DH40MB SDS MAX 1-9/16" Rotary Hammer
DH40RMY SDS MAX 1-9/16" Rotary Hammer
DMR13 1/2" Drill, "D" Handle
H30PV Hammer
H45MA SDS MAX Demolition Hammer
H45SA Demolition Hammer
H45SB Hammer
H45SB2 3/4" HEX 21/32" Round Demolition Hammer 8AMP
SP18T Sander Polisher
SP18T Sander Polisher
VRY38 Rotary Hammer
VTP-16A Hammer Drill
VTP-16A Hammer Drill
DH40MA SDS MAX 1-9/16" Rotary Hammer

Expand the 34 compatible machines

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

2 of 2 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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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, 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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Tool Type:

Hammer Drill

Parts Used:

Carbon Brush Set - 999-073

O-Ring - 986104

Repair Difficulty:

Hard

Time Spent Repairing:

1-2 hours

Tools Used:

Screwdriver, Pliers, Socket set, Wrench Set, Nutdriver, Adjustable Wrench

The hammer drill would not hammer

After installing the new parts the hammer drill still did not hammer.
I called a technician who advised me that excess grease would stop the hammer function. I removed the excess grease and Walla! It hammers now!

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Tool Type:

Demolition Hammer

Parts Used:

Carbon Brush Set - 999-073

1-1/2" Spline Shank Spline Shank Flat Demolition Bit Demolition - 985384

Repair Difficulty:

Easy

Time Spent Repairing:

15-30 minutes

Tools Used:

Screwdriver, Pliers, Socket set, Hex Allen Wrenchs

The Demolition Hammer was very slow in the pounding action.

I took the demolition hammer completely apart to check for damaged wires and also to clean the inside of demolition hammer from dust and to check the bearings.

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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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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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Great part, worked great!

The part was exactly what I needed.

Peter - 20 days ago Verified Purchase

Verified Purchase

eReplacementParts Team

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Product Information

Manufacturer: Hitachi

Product Number: 999-073

Classification: Part

Weight: 0.03 lbs.

Shipping: Ships Worldwide