DOWNLOAD Panasonic EY7840 Service Manual ↓ Size: 686.18 KB | Pages: 16 in PDF or view online for FREE

9

Procedure  1A → 1B → 1C → 1D → 1E

1. Remove the piston applying power spring.
2. Take out the power shaft assembly.
3. Remove the snap ring.
4. Slide the jig (plate) into between the washer and the gear case and 
hold it by a vise.
5. Tap the top of spindle block with a plastic hammer to take out the spin-
dle and clutch block assembly.
6. Take out the snap ring on the rear side of the bearing.
7. Take out two pins by using absorption force about 30N magnet from 
the clutch block.
8. Take out four steel balls and remove the spindle & piston assembly.
9. Remove the striker with the O-ring and the O-ring.  And take out the 
bearing.
10. Take out the piston block.  And take out the piston and the universal 
coupling.
11. Remove the intermediate shaft assembly.

10

1. Set the jig (bearing cap) into the clutch case and hold it with a vise in 
order to take out the bearing.
2. Assemble the bearing with the spindle assembly.
3. Set the snap ring.

It has own direction for reassembly. Place the rounded face of snap 
ring to the clutch case side.

4. Fit O-ring onto the bearing.
5. Insert the reciprocation bearing shaft into the hole of universal cou-
pling.  Make sure two thrust plates should be set both side of reciproca-
tion bearing shaft one of each.
6. Assemble the intermediate shaft assembly into the gear case from the 
motor side first.

Apply grease especially for the connection area between reciproca-
tion bearing and universal coupling.  In addition, hammer O-ring, 
inside of piston and cylinder for output shaft block also need to 
apply.
Air compressed by the piston drives hammer.  Take care to protect 
the piston and hammer from contamination by dust.

11

Procedure  2A → 2B

1. Set the H/D handle to HAMMER mode.
2. Insert the gear case assembly into the housing.
3. Connect the switch assembly with motor lead wires.

12