Maintenance And Inspection - Hitachi H45MRY Instruction Manual

again, and turn the switch on and off. This should
start the hammer operating. Repeat this procedure
for several minutes, and the hammer will heat, after
which it will operate when switched to ON-LOCK.

MAINTENANCE AND INSPECTION

WARNING:
Be sure to switch power OFF and disconnect the plug from the receptacle during maintenance and inspection.
1. Inspecting the tool
Since use of a dull tool will degrade efficiency and
cause possible motor malfunction, sharpen or
replace the tool as soon as abrasion is noted.
2. Inspecting the screws
Regularly inspect all screws and ensure that they
are properly tightened. Should any of the screws
be loose, retighten them immediately.
WARNING:
Using this Demolition Hammer with loosen screws
is extremely dangerous.
3. Inspecting the carbon brushes: (Fig. 10)
The motor employs carbon brushes which are
consumable parts. When they become worn to or
near "wear limit", it could result in motor trouble.
When an auto-stop carbon brush is equipped, the
motor will stop automatically. At that time, replace
both carbon brushes with new ones which have
the same carbon brush Nos. shown in the figure.
In addition, always keep carbon brushes clean and
ensure that they slide freely within the brush
holders.
CAUTION:
Using this Demolition Hammer with a carbon
brush which is worn in excess of the wear limit
will damage the motor.
Fig. 9
CAUTION:
After long time of use, the cylinder case becomes
hot.
Therefore, be careful not to burn your hands.
73
0.67" (17 mm)
Fig. 10
NOTE:
Use HITACHI carbon brush No. 73 indicated in Fig.
10
4. Replacing carbon brushes:
(For parts name, refer to Fig. 1)
Loosen the two set screws and remove the tail
cover. Remove the brush caps and carbon brushes.
After replacing the carbon brushes, tighten the
brush caps securely and to install the tail cover
with securely tightening two set screws.
5. Grease replacement
This machine is of fully oil sealed construction to
protect against dust incursion and to prevent
lubricant leakage. This machine can be used
English
Wear limit
No. of carbon brush
0.28" (7 mm)
9