Panasonic EY7451 User manual

© Panasonic Corporation 2018 Unauthorized copy-
ing and distribution is a violation of law.
Order Number PTD1808E01CE
Cordless Drill & Driver
Model No. EY7451
Europe
TABLE OF CONTENTS
PAGE
1 Safety Precautions----------------------------------------------- 2
2 Specifications ----------------------------------------------------- 2
2.1. EY7451 MAIN UNIT -------------------------------------- 2
2.2. MAXIMUM RECOMMENDED CAPACITIES ------- 2
3 Troubleshooting Guide ----------------------------------------- 3
3.1. Trial Operation (after checking
Troubleshooting Guide.) --------------------------------- 6
4 Disassembly and Assembly Instructions ---------------- 7
4.1. How to disassemble Plate hoot and Keyless
chuck.--------------------------------------------------------- 7
4.2. How to disassemble Main unit.------------------------- 8
5 Wiring Connection Diagram ---------------------------------13
6 Schematic Diagram ---------------------------------------------14
7 Exploded View and Replacement Parts List -----------15
7.1. PARTS LOCATION---------------------------------------15
7.2. REPLACEMENT PARTS LIST ------------------------16

2
1 Safety Precautions
Caution:
• Pb free solder has a higher melting point that standard solder; Typicall 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
2.1. EY7451 MAIN UNIT
2.2. MAXIMUM RECOMMENDED CAPACITIES
Motor 18V DC
No load speed
LOW 70 ~ 400/min (rpm)
HIGH 200 ~ 1400/min (rpm)
Chuck capacity 1.5 ~ 13mm (1/16" ~ 1/2")
Macimum torque Stalling torque (3.0Ah Li-ion Battery)
Clutch torque Approx. 0.5Nm (5.0kgf-cm, 4.3in-lbs) -4.4Nm (45.Okgf-cm, 39.0in-lbe)
Overall length 193mm (7-5/8")
Weight (with battery pack EY9L53) 1.65kg (3.751bs)
Motor EY7451
Screw driving
Machine screw M5
Wood screw 6.8 mm (17/64")
Self-drilling 6 mm (15/64")
Drilling for Wood 38 mm (1-3/8")
for Metal 13 mm (1/2")
for Masonry 

3
3 Troubleshooting Guide
(Refer to Wiring Connection Diagram)

4

5

6
3.1. Trial Operation (after checking Troubleshooting Guide.)
3.1.1. ASSEMBLY
1. Confirm if there is NO gap between Housing A and B by pinching the lead wires.
2. Confirm all screws are tightened firmly.
3. There should be no abnormal sound when shaking the unit.
4. There is no dust or deformation on battery terminals.
5. Confirm if there is no dirt when repairing.
3.1.2. OPERATION
1. Confirm the forward and reverse side of rotation.
2. Confirm if LED rights ON. Once battery pack is removed, press the switch handle; otherwise LED does not right ON.
3. Confirm if the tools may not become hot in a short operation.
4. Confirm the action when setting the DRILL mode.
5. Confirm if the chuck jaws move smoothly and hold the bit firmly.
3.1.3. SWITCH
1. Confirm the rotation of speed if it changes between 200-1400 ± 140 rpm in proportion to the amount of pushing level on switch
handle on HIGH mode and 70-400 ± 40 rpm on LOW mode.
2. Confirm if the rotation stops when releasing the switch handle.
3.1.4. CLUTCH
1. Check if the clutch torque changes suited for the number of clutch.

7
4 Disassembly and Assembly Instructions
4.1. How to disassemble Plate hoot and Keyless chuck.
4.1.1. Removal of the Housing.
Removal
1. Loosen a screw.
2. Take out the plate hook.
4.1.2. Removal of Motor screw.
NOTE:
When attaching or removing a bit, disconnect battery pack
from tool.
1. Set the clutch handle to position and select “LOW”
position.
2. Turn the lock collar counterclockwise (looking from the
front) to open the chuck jaws.
3. Use a screwdriver to turn the chuck fastening screw
inside the chuck clockwise direction of the arrow, and
remove the screw.
NOTE:
If the chuck fastening screw will not come loose, insert the
allen wrench into the chuck and lightly tap in the clockwise
direction with a hammer to tighten the chuck, and then
loosen the chuck fastening screw.
4. Insert the allen wrench into the chuck, and turn counter-
clockwise direction in the arrow with holding the unit by
the vise to remove the chuck.

8
4.2. How to disassemble Main unit.
4.2.1. Removal of the Housing.
1. Remove 8 housing screws.
4.2.2. Removal of Motor screw.
Removal
1. Remove 2 screws.
4.2.3. Removal of Switch and Driving
block.
Removal
1. Take out the switch assembly.
2. Take out the driving block.
3. Separate the motor from the gear box block by twisting
the motor to unlock tabs.

9
4.2.4. Removal or assembly of Control
PCB.
Removal
1. Take out the connector from the control PCB.
NOTE:
Make sure hold the connector at the bottom area.
Assembly
1. Insert the connector.
4.2.5. Removal or attachment of the Gear
Box Block.
Removal
1. Turn the thrust plate to remove.
2. The internal parts of gear box block can be removed one
after another.
Attachment
1. Start from inserting 6 pins into the driving block as shown
in the figure.
2. Assemble the other parts in reverse order as shown in the
figure.
NOTE:
Carriers and Ring Gears have their own correct directions
for proper reassembly.

10
4.2.6. Assembly of the Adjusting Screw and the Clutch Handle.
1. Hold the driving block with the click spring on top, and
align the narrow projection of adjusting screw with 45°
right side of the clutch case.
NOTE:
Make sure that the adjusting screw has its own correct
direction for proper assembly. Failure to do so, the clutch
handle does not rotate properly.
2. Turn the adjusting screw into the driving block about one
rotation for clockwise direction.
3. Set the clutch handle with position 1 on top.
(Align the position 1 of clutch handle with the narrow pro-
jection of driving block.)
4. Insert the clutch handle with adjusting the tabs of adjust-
ing screw to the groove of inside clutch handle.

11
4.2.7. Attachment of the H/L change han-
dle.
1. Insert the both side of handle spring into the groove of
Ring gear A.

12
4.2.8. Assemble of Driving block.

13
5 Wiring Connection Diagram

14
6 Schematic Diagram

15
7 Exploded View and Replacement Parts List
7.1. PARTS LOCATION
1
1
4
8
9
5
6
7
32
10
35
36
37
11
12
32
14
13
15
16
28
31
31
29
30
33
38
38
38
38
38
38
38
38
27
25
24
22 23
21
15
17
19
20
26
18
34

16
7.2. REPLACEMENT PARTS LIST
MODEL No.EY7451
Safety Ref. No. Part No. Part Name & Description Q'ty Remarks
1 WEY7451K3078 HOUSING AB SET 1
2 WEY6450L6808 CHUCK FASTENING SCREW 1
3 WEY7441K7917 KEYLESS CHUCK 1
4 WEY7441H3227 CLUTCH HANDLE 1
5 WEY7441L0637 ADJUSTING SCREW 1
6 WEY7441L0177 CLUTCH SPRING 1
7 WEY7441L0577 CLUTCH PLATE 1
8 WEYT107L0457 CLICK SPRING A 1
9 WEY7460H3237 H/L CHANGE HANDLE 1
10 WEY7460H3248 F/R SELECTOR HANDLE 1
11 WEY7441L6968 STEEL BALL 12 (5)(12PCS/PK)
12 WEY7441L1088 DRIVING BLOCK 1
13 WEY7441L1138 CARRIER 1
14 WEY7441L1428 RING GEAR 1
15 WEY7441L1348 PLANET GEAR 6 (3PCS/PK)
16 WEY7441L0858 THRUST PLATE 1 (37.95)
17 WEY7441L1118 CARRIER 1
18 WEY7441L0268 STOPPPER 1
19 WEY7441L1768 GEAR CASE 1
20 WEY7441K9628 TAPPING SCREW 4 (K3-12)
21 WEY7441L1458 RING GEAR A 1
22 WEY7441L1128 CARRIER B 1
23 WEY7441L1468 RING GEAR B 1
24 WEY7441L1368 PLANET GEAR B 3 (3PCS/PK)
25 WEY7441L0888 THRUST PLATE 1 37.8
26 WEY7441L4057 GEAR BOX BLOCK 1
27 WEY7451L1008 MOTOR ASSEMBLY 1
28 WEY7441L2579 MOTOR BRUSH ASSEMBLY 1
29 WEY7441L0128 FIXING PLATE 1
30 WEY7441L2007 SWITCH ASSEMBLY 1
31 WEY7441L6028 SCREW 2 (K3-6)
32 WEY7441L0378 ROLLER SET 6 (3.175*7.2)(6PCS/PK)
33 WEY7451L2118 WATERPROOF CIRCUIT ASSEMBLY 1
34 WEY7451K3958 OPERATION PANEL 1
35 WEY7543K3187 PLATE HOOK 1
36 WEY7441L6487 NUT 1 (M4)
37 WEY7441K6217 SCREW 1 (4-14)
38 WEY7441K9038 TAPPING SCREW 8 (K3-20)
- WEY9633K7010 TOOL CASE 1
- WEY7441K81P0 OPERATING INSTRUCTIONS 1