Nakayama 021841, User Manual

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Chain and guide bar
Use only guide bar (7) and saw chain (6) according to the technical data of the product.
WARNING! Always use a saw chain designed as “low-kickback” or a saw chain which meets the low-kickback requirements! A standard saw chain (a chain
which does not have the kickback reducing guard links) should only be used by an experienced professional operator!
Nevertheless, a low-kickback saw chain does not completely eliminated kickback! A low-kickback or “safety” chain should never be regarded as complete
protection against injury! Therefore always use a low-kickback saw chain in conjunction with other kickback protection devices such as the front hand guard!
1. Place the product on a suitable flat surface with the rear handle (1) facing upward.
WARNING! Before removing the cover (17), ensure the chain brake is disengaged. If in the engaged position, pull the front hand guard (5) backwards until it
‘clicks’ into position, see section “Product functions – Chain brake”.
2. Loosen the retaining nut (10) with the multitool (31) and remove it together with the cover (17).
3. Ensure the spiked bumper is properly fixed to the product. Tighten the screws as necessary.
4. Place the slot in the guide bar (7) over the bolt (11). Ensure to fit the guide bar (7) with the saw chain ‘cutter’ symbol at the top of the bar (Fig. 1).
5. Push the guide bar (7) to the left towards the drive sprocket (14) (behind the clutch (15) (Fig. 2).
WARNING! The direction of the saw chain ‘cutters’ must be as indicated by the symbol and arrow on the guide bar!
6. Place the saw chain (6) over the drive sprocket (14) behind the clutch (15) and fit around the guide bar (7). Make sure the chain is placed above the chain
catcher (13) (Fig. 3).
7. The saw chain movement is as indicated by the arrow (Fig. 4). Make sure the chain is properly placed over the sprocket wheel (8) of the guide bar (7).
8. Pull the guide bar (7) carefully towards the right to tighten the saw chain (6) (Fig. 5).
9. Refit the cover (17). If necessary adjust the tension pin (16a) by turning the tension screw (16) with the multitool (31) in or out until it reaches a position
where the pin can be inserted into the lower hole on the guide bar (7) (Fig. 6).
10. Secure the cover with the retaining nut (10)(Fig. 7).
NOTE: Fix the nut finger tight only at this stage. The chain tension cannot be adjusted with the retaining nut tightened - it must be loosened first.
NOTE: The saw chain (6) has not yet been tensioned. Tension the chain as described under “Saw chain tensioning”. After operating the product for approxi -
mately one hour, adjust the chain tension again.
Saw chain tensioning
Always check the saw chain tension before use, after the first cuts and regularly during use, approx. every five cuts. Upon initial operation, new chains can
lengthen considerably. This
is normal during the break-in period and the interval between future adjustments will lengthen quickly.
WARNING! Disconnect the spark plug connector before adjusting saw chain tension!
The cutting edges of the saw chain are sharp! Always wear protective gloves when handling chain!
Always maintain proper chain tension! A loose chain increases the risk of kickback! A loose chain may jump out of the guide bar groove! This may injure the
operator and damage the chain! A loose chain will cause rapid wear to the chain, guide bar and sprocket!
Tensioning the chain too tightly will overload the motor and cause damage, and insufficient tension can cause chain derailing, whereas a correctly tightened
chain provides the best cutting characteristics and prolonged working life! The chain life mainly depends upon sufficient lubrication and correct tensioning!
NOTE: The chain tension can not be adjusted with the retaining nut tightened - they must be loosened first.
1. Lift up the tip of the guide bar (7) and keep it there as you adjust the tension (Fig. 8).
2. Turn the tension screw (16) until the chain ‘tie straps’ are just touching the bottom edge of the guide bar (7) (Fig. 9, 10).
3. Lift up the tip of the guide bar (7) and tighten the retaining nut (10).
4. Pull the saw chain (6) along the top of the guide bar (7) by hand from one end to the other, several times. The chain should feel tight but still move freely.
Tension test
1. Check the chain tension using one hand
to lift the saw chain (6) against the weight
of the product. The correct chain tension is achieved when the saw chain can be lifted by approximately 2 - 4 mm from the guide bar (7) in the centre (Fig.
11, 12).
2. Adjust the tension if you find that the chain saw is too loose or tight.
Chain lubrication
WARNING! The product is not filled with chain oil. It is essential to fill the product with chain oil before using it! Never operate the product without chain oil
as this will result in extensive damage to the product!
Operating the saw chain dry or with too little chain oil will decrease cutting efficiency, shorten the product life span and cause rapid wear to the saw chain
and guide bar from overheating!
Insufficient chain oil is evident by smoke or bar discolouration! Adequate lubrication of the saw chain during cutting operations is essential to minimise
friction with the guide bar!
1. Place the product on a stable, level surface with the oil tank cap (26) facing upward. We recommend laying a non-flammable sheet under the product.
2. Unscrew and remove the oil tank cap (26) (Fig. 13).
3. Fill suitable lubricant into the tank using an oil funnel fitted with a filter to avoid debris entering the tank. Do not overfill and leave approximately 5 mm of
space between the top of the oil and the inside edge of the tank to allow for expansion (Fig. 14)
NOTE: Use a special type chainsaw chain lubricant all year round.
NOTE: Towards the end of the season, it is advisable to put only as much lubricant in the tank as you need for each cut, so that it is completely used up
before you store the product.
4. Wipe up spilled lubricant with a soft cloth and refit the oil tank cap (26). Use the multitool (31) to tighten the cap (26) properly.
Checking
NOTE: Perform the following test before operating your product.
This product is equipped with an automatic oiling system! The oiling system automatically delivers the proper amount of oil to the bar and chain!
Checking the lubrication requires starting the engine. Before checking, the product must be fully assembled and all instructions must have been read.