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12

English (Original Instructions)

1. 

Underbuck the branch 1/3 through for your first cut (A).

2.  Overbuck the branch to drop it (B).

3.  Finish by cutting smoothly and neatly against the main 

member (C) so the bark will grow back to seal the 

wound.

 WARNING

If the limbs to be pruned are above chest height, hire a 

professional to perform the pruning.

CUTTING SPRING POLES

See figure 37.

A spring pole (A) is any log, branch, rooted stump, or 

sapling which is bent under tension by other wood so that 

it springs back if the wood holding it is cut or removed. 

On a fallen tree, a rooted stump has a high potential of 

springing back to the upright position during the bucking 

cut to separate the log from the stump. Watch out for 

spring-poles; they are dangerous.

 WARNING

Spring poles are dangerous and could strike the 

operator causing the operator to lose control of the 

chainsaw. This could result in severe or fatal injury to 

the operator.

MAINTENANCE

REPLACING THE BAR AND CHAIN

See figure 3. See figure 38 - 47.

 

 DANGER

Never start the engine before installing the guide bar, 

chain, drivecase cover, and clutch drum. Without all 

these parts in place, the clutch can fly off or explode, 

exposing the user to possible serious injury.

 WARNING

To avoid serious personal injury, read and understand 

all the safety instructions in this section.

1.  Always place the switch in the stop “O” position before 

you work on the saw.

2.  Make sure the chain brake is not set by pulling the 

chain brake lever/hand guard towards the front handle 

to the run position.

3.  Wear gloves when handling the chain and bar. These 

components are sharp and may contain burrs.

4.  Remove the bar mounting nuts (B) using a combination 

wrench (C) or a 13mm socket wrench spanner.

5.  Remove the clutch cover (D).

6.  Lay out the new saw chain in a loop and straighten any 

kinks. The cutters should face in the direction of chain 

rotation. If they face backwards, turn the loop over.

7.  Place the chain drive links into the bar groove.

8.  Position the chain so there is a loop at the back of 

the bar.

9.  Hold the chain in position on the bar and place the loop 

around the sprocket (J).

10. 

Fit the bar flush against the mounting surface so that 

the bar studs (P) in the chassis are in the long slot of 

the bar.

11. Replace the clutch cover ensuring that the adjusting 

pin (L) in the clutch cover is in the bar tensioning pin 

hole and that both bar studs (P) are in their respective 

holes (K) in the clutch cover. 

NOTE:

 The adjusting pin (L) may need to be slightly 

repositioned with the chain tensioning screw so that it 

is aligned with the position of the bar chain tensioning 

pin hole.

12. 

Replace and finger tighten the bar mounting nuts. The 

bar must be free to move for tension adjustment.

13. Remove all slack from the chain by turning the chain 

tensioning screw (M) clockwise until the chain seats 

snugly against the bar with the drive links in the bar 

groove.

14. Lift the tip of the guide bar up to check for sagging (N).

15. Release the tip of the guide bar and turn the chain 

tensioning screw (M) 1/2 turn clockwise. Repeat this 

process until sagging does not exist.

16. Hold the tip of the guide bar up and tighten the bar 

mounting nuts (B) securely.

The chain is correctly tensioned when there is no sagging 

on the underside of the guide bar, the chain is snug, but 

can be turned by hand without binding. Ensure that the 

chain brake is not set.

NOTE:

 If chain is too tight, it will not rotate. Loosen the 

bar nuts slightly and turn the tension adjuster 1/4 turn 

anticlockwise. Lift the tip of the guide bar up and retighten 

the bar nuts securely. Ensure that the chain will rotate 

without binding.

ADJUSTING THE CHAIN TENSION

See figure 48 - 50.

 WARNING

Never touch or adjust the chain while the motor is 

running. The saw chain is very sharp. Always wear 

protective gloves when performing maintenance on the 

chain.

Summary of Contents for RCS4640N

Page 1: ...RCS4640N PETROL CHAINSAW Important It is essential that you read the instructions in this manual before assembling maintaining and operating this machine...

Page 2: ...assembled Be sure that the saw chain stops moving when the throttle control trigger is released GENERAL PRECAUTIONS Know your tool Read the operator s manual carefully Learn the saw s applications an...

Page 3: ...g protection reduces the ability to hear warnings shouts or alarms The operator must pay extra attention to what is going on in the work area Keep bystanders and animals out of the work area Do not al...

Page 4: ...Symptoms include episodic blanching of fingers in response to cold numbness and tingling In extreme cases it will cause loss of touch sensation Anti vibration system does not guarantee that you will...

Page 5: ...and bar lubricant to the chain and bar oil reservoir every time you add fuel to the chain saw fuel tank Mix fuel outdoors where there are no sparkles or flames Do not smoke when mixing fuel or filling...

Page 6: ...ngth 375 mm Chain pitch 8 26 mm 0 325 Chain gauge 1 27 mm 0 05 Chain type 0 325 low profile full complement Drive sprocket 7 teeth x 0 325 Engine displacement 46 cm3 Maximum engine power ISO 7293 1 8...

Page 7: ...WARNING Kick back occurs when the moving chain contacts an object at the upper portion of the tip of the guide bar or when the wood closes in and pinches the saw chain in the cut Contact at the upper...

Page 8: ...nt only Mix 2 lubricant into the petrol This is a 50 1 ratio Mix the fuel thoroughly and also each time before refuelling Mix in small quantities Do not mix quantities larger than usable in a 30 day p...

Page 9: ...t do not attempt to start in the full choke position skip step 5 Push and release primer bulb 10 times Pull the choke out and push it back to the original run position STOPPING THE ENGINE See figure 1...

Page 10: ...trigger as soon as the cut is completed allowing the engine to idle Running the saw at full throttle without a cutting load may result in unnecessary wear to the chain bar and engine 7 Do not put pres...

Page 11: ...quipment Do not cut down trees having an extreme lean or large trees with rotten or dead limbs loose bark or hollow trunks Have these trees pushed or dragged down with heavy equipment then cut them up...

Page 12: ...operations stand on the uphill side so that the cut off section of the log cannot roll over you Sometimes it is impossible to avoid pinching with just standard cutting techniques or difficult to predi...

Page 13: ...he cutters should face in the direction of chain rotation If they face backwards turn the loop over 7 Place the chain drive links into the bar groove 8 Position the chain so there is a loop at the bac...

Page 14: ...e A Too low increases the potential for kick back Not low enough decreases cutting ability If the cutter teeth hit hard objects such as nails and stones or are abraded by mud or sand on the wood have...

Page 15: ...any of the following faults should be replaced Wear inside the bar rails which permits the chain to lie over sideways Bent guide bar Cracked or broken rails Spread rails In addition lubricate guide b...

Page 16: ...will seriously damage the engine WARNING Silencer surfaces are very hot during and after operation of the chainsaw Keep all body parts away from the silencer Serious burns may occur if contact is made...

Page 17: ...or damaged parts Before each use For loose fasteners Before each use For loose parts Before each use Chain brake function Before each use For fuel leaks Before each use Inspect and Clean Bar Before ea...

Page 18: ...carburettor adjustment Engine starts but will not run properly at high speed Carburettor requires H High jet adjustment Contact a service dealer for carburettor adjustment Engine does not reach full s...

Page 19: ...cant is on the guide bar contact a service dealer Bar and chain running hot and smoking Chain brake engaged Release chain brake refer to Operation operating chain brake earlier in this manual Chain te...

Page 20: ...tronic Industries Australia Pty Ltd Level 1 660 Doncaster Road Doncaster VIC 3108 Australia Techtronic Industries New Zealand Ltd 18 26 Amelia Earhart Avenue Mangere Auckland 2022 New Zealand 96099401...

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