Panasonic EY7881 User manual

© Panasonic Corporation 2018. All rights reserved.
Unauthorized copying and distribution is a violation
of law.
ORDER NO. PTD1809E53CE
Cordless Rotary Hammer
Model No. EY7881
Europe
TABLE OF CONTENTS
PAGE PAGE
1 Warning -------------------------------------------------------------- 2
2 Specifications ----------------------------------------------------- 2
3 Troubleshooting Guide ----------------------------------------- 3
4 Disassembly and Assembly Instructions ---------------- 6
5 Exploded View and Replacement Parts List -----------11

2
1Warning
Caution:
• Pb free solder has a higher melting point that standard solder; Typically the melting point is 50 - 70 °F (30 - 40 °C) higher.
Please use a soldering iron with temperature control and adjust it to 750 ± 20 °F (400 ± 10 °C). In case of using high temperature
soldering iron, please be careful not to heat too long.
• Pb free solder will tend to splash when heated too high (about 1100°F / 600 °C).
2 Specifications

3
3 Troubleshooting Guide
3.1. Troubleshooting Guide

4

5
3.2. Trial Operation (after checking Troubleshooting Guide).
3.2.1. Hammer/Drill
• Confirm the action when setting the H/D handle to HAMMER mode.
Rotation with hammering may work when the drill bit touches something like concrete or hard type of wood block. And confirm
the power.
It is OK, if it takes about 5 seconds by 20kgf to hole (Φ6×30) on the concrete.
• Confirm the action when setting the H/D handle to DRILL mode.
No hammering when the drill bit touches something like concrete or hard type of wood block. And confirm the forward and
reverse side of rotation.
3.2.2. Switch
• Change the rotation speed in proportion to the amount of pushing level on switch trigger.
Low mode: 0-560 min-1 (rpm)
Middle mode: 0-680 min-1 (rpm)
High mode: 0-840 min-1 (rpm)
3.2.3. Control PCB
• Press the light button on the operation panel to confirm that the LED light up.
• Check if the battery low warning lamp is lit properly.
• Disengage the lock lever and pull the battery pack to confirm that the battery level indicator lamp flashes.
3.2.4. Assembly
• Confirm if there is NO gap between Housing A and B by pinching the lead wires.
• Confirm all screws are tightened firmly.
• Confirm that the bellows contract smoothly.
• Install the dust collection system to the main unit and confirm proper operation.

6
4 Disassembly and Assembly Instructions
* To reduce the risk of injury, always remove battery pack before removing/attaching the tool.
* To assemble the tool, start with 4.6. and proceed to 4.1.
4.1. How to remove the Chuck handle.
4.2. How to remove the Housing.
1. Loosen the support handle and take it out from the unit.
2. Pluck the chuck cover depressing the chuck handle.
Note:
If it is hardly to take out, use the slotted-head screwdriver.
3. Remove the chuck handle.
4. Take out a steel ball pushing the chuck spring with the chuck spring
plate.
5. Remove the chuck spring plate and chuck spring.
1. Remove 21pcs delta PT screws.
2. Remove 2pcs truss TP screwss.
3. Remove the H/D handle.
Note: (when assembling)
When reassembling, make sure that the elongated hole in the joint
installed in the bellows is positioned on the grip side.

7
4.3. How to remove the Driving block
1. Remove the delta PT screws, tight screws and felt.
2. Remove the Gear case B.
3. Remove the motor assembly, switch and module assembly from the
gear case A.
4. Remove the crank shaft assembly and gear shaft assembly.
Note: (when replacing the motor assembly’s bearing)
Use a pulley removal tool to dismount the bearing.
5. Remove the cylinder assembly from the gear case A.
6. Remove the shaft and piston assembly.
Note:
The o-ring cannot be reused after being repaired.
7. Detach the round S-type retaining ring by using a snap ring plier or
the like, and then dismount the bearing by using a pulley removal tool.

8
4.4. Check the following when replacing the O-ring.
• The O-ring should extend slightly from the edge face of the hammer/striker.
• Make sure that the O-ring is not worn.
• Make sure that the installed O-ring is not twisted.
8. Remove the pins by using a magnet, and dismount the spindle,
striker, striker stopper and O-ring.

9
4.5. Apply grease

10
4.6. Wiring and Assembly Points.

Model No. : EY7881 Exploded View
5 Exploded View and Replacement Parts List

Model No. : EY7881 Parts List
Change Safety Ref.
No. Part No. Part Name & Description Q'ty Remarks
EY7881
1 WEY6813K4627 AUXILIARY HANDLE 1
2 WEY6813H3927 GRIP 1
3 WEY6813K4637 SUPPORT HANDLE 1
4 WEY6813H7727 DEPTH GAUGE 1
5 WEY6813H3117 CHUCK COVER 1
6 WEY6813K3127 CHUCK HANDLE 1
7 WEY6813L0427 BALL GUIDE 1
8 WEY6813L0437 CHUCK SPRING STRIKE PLATE 1
9 WEY6813L0916 CHUCK SPRING 1
10 WEY6813L1917 STEEL BALL 1
11 WEY7881K9567 DELTA PT SCREW 24 (4*20), (5PCS/PK)
12 WEY7881S9567 TRUSS TP SCREW 2 (2PCS/PK)
13 WEY7881S0837 METAL COLLAR 2 (2PCS/PK)
14 WEY7881K3078 HOUSING AB SET 1
15 WEY7881K3937 GRIP AB SET 1
16 WEY7881S6067 TIGHT SCREW 9 (K4*10), (5PCS/PK)
17 WEY7881S1847 GEAR CASE A 1
18 WEY7881S1857 GEAR CASE B 1
19 WEY7881K0957 SEAL LS SET 1
20 WEY7881L1987 PISTON ASSEMBLY 1
21 WEY7881S1617 HAMMER 1
22 WEY6812L0976 O-RING 1
23 WEY7881S1207 CYLINDER ASSEMBLY 1
24 WEY7881S1987 SPINDLE 1
25 WEY7881K0937 O-RING 1 (22.5*1.5)
26 WEY7881L1237 STRIKER 1
27 WEY7881K0947 O-RING 1 (11.8*2.4)
28 WEY7881L0497 STRIKER STOPPER 1
29 WEY7881K0997 O-RING 1 (18*3.55)
30 WEY7881L3717 RUBBER HOLDER 1
31 WEY7881K0967 O-RING 1 (9.12*3.53)
32 WEY7881K0417 RETAINING RING 1
33 WEY7881S0507 PIN 1 (4PCS/PK)
34 WEY7881S4957 BEARING 1
35 WEY7881K0427 RETAINING RING 1
36 WEY7881L0487 THRUST PLATE 1
37 WEY7881L0367 BEVEL GEAR SLEEVE 1
38 WEY7881L0647 RETAINING RING 1
39 WEY6813L0367 O-RING 1
40 WEY6812L0386 SHAFT 1
41 WEY7881K0977 O-RING 1
42 WEY7881S1527 GEAR SHAFT ASSEMBLY 1
43 WEY7881S1537 CRANK SHAFT ASSEMBLY 1
44 WEY7881K1587 CHANGE LEVER 1
45 WEY7881K0987 O-RING 1
46 WEY7881K0187 CLICK SPRING 1
47 WEY7880B6967 STEEL BALL 1
48 WEY74A2K3959 OPERATION PANEL 1
49 WEY7880L0257 LOCK LEVER 1
50 WEY7880L0287 PIN 1
51 WEY7880L0187 SPRING 1
52 WEY7880L3147 F/R HANDLE 1
53 WEY6803L2337 LED COVER 1
54 WEY7881K3127 DUST TERMINAL COVER 1
55 WEY7880L0167 PLATE SPRING 1
56 WEY7881H3237 H/D HANDLE 1
57 WEY7880L3137 TRIGGER COVER 1
58 WEY7880L0507 PIN 1 (3*34)
59 WEY7881K3107 BELLOWS 1
60 WEY7881K1447 JOINT 1
61 WEY7881W0297 SPRING RECIEVER A 1

Model No. : EY7881 Parts List
Change Safety Ref.
No. Part No. Part Name & Description Q'ty Remarks
62 WEY7881L3537 ANTI-VIBRATION SPRING 1
63 WEY7881W0487 SPRING RECIEVER B 1
64 WEY7881L2007 SWITCH 1
65 WEY75A8W3127 CONNECTOR COVER 6P 1
66 WEY7881L2887 LED HARNESS 1
67 WEY75A8W3117 CONNECTOR COVER 2P 1
68 WEY7881L1007 MOTOR ASSEMBLY 1
69 WEY7881S4377 ROTOR BEARING ASSEMBLY 1
70 WEY7881S1127 BEARING 1
71 WEY7881L2087 8-PIN CONNECTOR 1
72 WEY7880L2157 BATTERY TERMINAL BASE 1
73 WEY7881F0247 FELT 1
- WEY7881K8108 OPERATING INSTRUCTIONS 1
- WEY004X8987 GREASE 1
- WEY003W8957 GREASE (PERMALUB) 1
- WEY6811X5537 GREASE (ASG-22) 1