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Makita EN4950H Technical Manual

Makita EN4950H Technical Manual

Petrol pole hedge trimmer
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T
ECHNICAL INFORMATION
Models No.
Description
C
ONCEPT AND MAIN APPLICATIONS
Model EN4950H is Pole hedge trimmer as a successor of PTR2500.
The advantages are as follows:
• 25.4cm³ 4-stroke engine with the multi-position engine lubrication system.
• 180° foldable hedge trimmer head for easy transport and storage
• Built-in clutch to prevent unintentional blade motion while the hedge
trimmer head is 180° folded
This product is also available with an E25 compatible engine
as Model EN4950HG.
S
pecification
Type
Displacement: cm³ (cu.in.)
Fuel
Engine
Max. output: kW (PS)
Max. torque: N.m
Speed:
min.
¹
rpm
ˉ
=
Engine oil
Compliance with main exhaust emission regulations;
CARB Tier 3,EPA Phase 2, EU Stage 2
Blade length: mm (")
Trimmer
Strokes per minute: spm
blade
Angle adjustment range: degrees
Carburetor
Starting system
Fuel tank capacity: L (US oz)
Primer pump
Clutch
Handle style
Net weight*
: kg (lbs)
2
*1 from the horizontal position
*2 Dry weight
S
tandard equipment
Blade cover ............................................................ 1
Socket wrench 10-16 ............................................. 1
Hex wrench 4 ......................................................... 1
Accessory bag ....................................................... 1
Oil set (inc. 80mL oil) ........................................... 1 (for some countries only)
Shoulder strap ........................................................ 1 (for some countries only)
Goggles .................................................................. 1 (for some countries only)
End cover set ......................................................... 1 (for some countries only)
Note: The standard equipment for the tool shown above may vary by country.
O
ptional accessories
Hedge trimmer head set
Shear blade assembly with End cover
Shear blade assembly without End cover
End cover set (for some countries only)
EN4950H, EN4950HG
Petrol Pole Hedge Trimmer
(Pole Hedge Trimmer
*1
American countries)
at max. output power
No load
for North and Central
4-stroke
25.4 (1.5)
Straight unleaded gasoline
0.77 (1.1) [at 7,000 min.
1.1 [at 5,500 min.
7,000
10,000
SAE10W-30 oil
in the class SF or higher of API Classification
Yes
490 (19-1/4)
2,100
135° (45° tilt-up*
, 90° tilt-down*
1
Diaphragm
Recoil starter with automatic decompression
0.6 (20.3)
Yes
Yes
Loop handle
6.9 (15)
PRODUCT
L
W
H
Dimensions: mm (")
Length (L)
2,550 (100-1/2)
Width (W)
242 (9-1/2)
Height (H)
241 (9-1/2)
¹]
ˉ
¹]
ˉ
)
1
P 1/ 18

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Summary of Contents for Makita EN4950H

  • Page 1 North and Central American countries) ONCEPT AND MAIN APPLICATIONS Model EN4950H is Pole hedge trimmer as a successor of PTR2500. The advantages are as follows: • 25.4cm³ 4-stroke engine with the multi-position engine lubrication system. • 180° foldable hedge trimmer head for easy transport and storage •...
  • Page 2: Necessary Repairing Tools

    P 2/ 18 epair CAUTION: Repair the machine in accordance with “Instruction manual” or “Safety instructions”. [1] NECESSARY REPAIRING TOOLS Code No. Description Use for 1R003 Retaining ring pliers ST-2N removing Spiral bevel gear 9 1R004 Retaining ring pliers ST-2 for External ring removing/ installing Retaining rings S-12 and S-24 1R005 Retaining ring pliers RT-2N for Internal ring...
  • Page 3: Lubricant And Adhesive Application

    Portion to apply adhesive Amount Cylinder block assembly Mating surface to Crank case a little Fig. 1 Cam A : Makita grease N. No.2 : Makita grease SG. No.0 : ThreeBond 1215 : Molybdenum disulfide : Makita grease N. No.1 Reel Starter case Note: The adhesive must not be put into the oil route.
  • Page 4 P 4/ 18 epair [4] DISASSEMBLY/ASSEMBLY [4]-1. Warning Follow the instructions described below in advance before repairing: • Wear gloves. • Attach the blade cover to the blade. • When the engine is hot from use, cool down the engine enough or you can get burned. •...
  • Page 5 P 5/ 18 epair [4] DISASSEMBLY/ASSEMBLY [4]-4. Pipe complete DISASSEMBLING (1) Remove M5x16 Hex socket head bolt with flat washer and spring washer and M5x25 Hex socket head bolt, and then separate Trimmer head ass’y from Shaft and Pipe complete manually or using Waterpump pliers and Plastic hammer as drawn in Fig.
  • Page 6 P 6/ 18 epair [4] DISASSEMBLY/ASSEMBLY [4]-5. Trimmer head ass’y Fig. 12 DISASSEMBLING M4x16 Hex socket head bolt (6 pcs.) (1) Remove Trimmer head ass’y from Pipe. (2) Turn the machine upside down. Loosen six M4x16 Hex socket Under head bolts and then remove Under cover. (Fig. 12) cover Remove Plate and Gasket from the upper side (viewed from Under cover installation side) in Gear housing complete.
  • Page 7 P 7/ 18 epair Fig. 18 [4] DISASSEMBLY/ASSEMBLY [4]-5. Trimmer head ass’y (cont.) 1R236 (7) Remove M8x8 Hex socket head bolt from Gear housing M8x8 Hex socket complete, and insert 1R236 into the threaded hole, then head bolt press down 1R236 to remove the assembled part of Gear housing Spiral bevel gear 12 and two Ball bearings 6000ZZ from complete...
  • Page 8 P 8/ 18 epair [4] DISASSEMBLY/ASSEMBLY [4]-5. Trimmer head ass’y (cont.) (14) Pipe holder section is now disassembled as drawn in Fig. 26. (15) Remove Retaining ring R-22 from the inside of Joint with 1R005. (Fig. 27) (16) Insert the tips of 1R003 in the space between Spiral bevel gear 9 and the round projection in Joint, open the tips to remove Spiral bevel gear 9 from Joint.
  • Page 9 P 9/ 18 epair [4] DISASSEMBLY/ASSEMBLY [4]-5. Trimmer head ass’y (cont.) ASSEMBLING Assemble by reversing the disassembly procedure. Be careful to the following points. • Press-fit Spindle complete into Pipe holder with 1R029. (Fig. 30) • Press-fit the module of Spiral bevel gear 12 and two Ball bearings 6000ZZ into Gear housing with 1R030. (Fig. 31) •...
  • Page 10 P 10/ 18 epair [4] DISASSEMBLY/ASSEMBLY [4]-6. Clutch Fig. 34 M6x25 shoulder 13mm DISASSEMBLING hex bolt (2pcs.) Socket bit Note: (1) Clutch can be easily removed with Impact driver without holding the piston. (2) Do not remove Spark plug as compressed air resistance has to be used for the disassembling.
  • Page 11 P 11/ 18 epair [4] DISASSEMBLY/ASSEMBLY [4]-8. Ignition Fig. 40 CHECK OF PLUG CAP Plug cap Tester (1) Remove Plug cap from Spark plug, then detect the continuity Plug cap spring between Plug cap spring in Plug cap and Earth terminal of Ignition coil.
  • Page 12 P 12/ 18 epair [4] DISASSEMBLY/ASSEMBLY [4]-9. Flywheel DISASSEMBLING Note: • Flywheel can be easily removed with Impact driver without holding the piston. • Do not remove Spark plug as compressed air resistance has to be used for the disassembling. •...
  • Page 13 Reel. (Fig. 50) (2) Apply a little amount of Makita grease N No.2 to the spring. (3) Make a knot on the new rope end and pass it through Reel and Starter case, then connect the other end to Starter knob.
  • Page 14: Cleaning & Maintenance

    P 14/ 18 epair [4] DISASSEMBLY/ASSEMBLY [4]-11. Carburetor Fig. 56 DISASSEMBLING Cleaner cover assembly (1) Loosen M4 Thumb screw and remove Cleaner cover assembly. Fig. 58 (Fig. 56) (2) Remove two kinds of Air cleaner elements. (Fig. 57) M5x60 Hex. socket button (3) Remove two M5x60 Hex.
  • Page 15 P 15/ 18 epair [4] DISASSEMBLY/ASSEMBLY Fig. 63 [4]-11. Carburetor (cont.) (Nipple to connect yellow tube of Tank) ASSEMBLING Carefully assemble each part in right direction and order. 1R127 TEST OF AIRTIGHT STRUCTURE Connect 1R127 to the nipple of Carburetor as drawn in Fig. 63. Give air pressure from 1R127 and check if the pressure gauge indicates Nipple of Carburetor to connect 0.05Mpa for around 10 seconds, then, there is no problem with Carburetor.
  • Page 16 P 16/ 18 epair [4] DISASSEMBLY/ASSEMBLY [4]-14. Spark arrester (Only for some countries, i.e., having dry atmospheres at high temperature) Fig. 68 MAINTENANCE (1) Remove Cylinder cover. Spark arrester (2) Remove Exhaust Muffler. (3) Remove Spark arrester from Exhaust muffler. (Fig. 68) Sweep it off if dirt or soot is on Spark arrester.
  • Page 17 (1) Piston can be assembled in either direction. Apply a little amount of Makita grease N No. 2 to the needle bearing of Crank shaft assembly in advance. (2) Insert Piston pin through Piston and Crank shaft, and fix it with Clips by using an awl (Clip has no direction).
  • Page 18 P 18/ 18 epair [4] DISASSEMBLY/ASSEMBLY [4]-15. Engine block (cont.) ASSEMBLING (6) Adjust the valve clearance as follows: • Align the marking on Flywheel with the marking on Ignition coil. (Fig. 74) • Align the marking on Cam gear assembly with the marking on Cylinder block. (Fig. 75) •...

This manual is also suitable for:

En4950hg