Assembling The Bar And Chain - Efco PTX 2710 Manual De Instrucciones

MAINTENANCE

Assembling the Bar and Chain

WARNING: Check the chain tension frequently when
operating the pole pruner. Never touch or adjust the
chain while the engine is running. The pole pruner
chain is very sharp, always wear protective gloves
when performing maintenance to the chain.
1. Remove the two (2) bar nuts (A, Fig. 55) and the cover (B).
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2. Adjust the chain tensioning pin (C) fully towards the cover
band by turning the chain tensioning screw (D) counterclockwise
as shown in inset (Fig. 56).
3. The guide bar (E, fig. 57) contains a bar stud slot that fits over
the bar studs (F). The guide bar also contains two chain
tensioning pin holes (G) and two lubrication holes, one per
side. The bar is reversible and either tensioning pin hole may
be utilized with the chain tensioning pin.
4. Place the guide bar (E) onto the bar studs (F) as shown in
Fig. 57.
5. Position the guide bar (E) tip through the chain (H) loop as
shown in Fig. 58. The cutters on the top of the guide bar
should face toward the bar nose, in the direction of the chain
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rotation. See inset (L) of Fig. 59.
6. Fit the chain (H, fig. 58) over the rim sprocket (M) and into bar
groove.
CAUTION: Severe damage can occur to the rim
sprocket, clutch drum, guide bar and chain, if the
chain is not correctly seated into the rim sprocket.
7. Replace the cover (B). Turn the chain tensioning screw (D)
clockwise until the chain tensioning pin (C) fits into the chain
tensioning pin hole (G). Install the two bar nuts (A). Tighten the
bar nuts finger tight only. The bar must be free to move for
57
tension adjustment.
CAUTION: Failure to ensure that the chain tensioning
pin is in the chain tensioning pin hole will result in
severe damage to the pole pruner during reassembly
of the sprocket cover.
8. Remove all slack from chain by turning the chain tensioning
screw (D) clockwise, assuring that the chain seats into the
bar groove during tensioning.
9. Lift the tip of the guide bar up to check for sag, see Fig. 60,
pag. 24. Release the tip of the guide bar, and turn the chain
58
tensioning screw (D) 1/2 turn clockwise. Repeat this process
until sag does not exist.
10. Hold the tip of the guide bar up and tighten the bar nuts (A)
securely as shown in Fig. 55.
11. Chain is correctly tensioned when there is no slack on the
underside of the guide bar, the chain is snug, but it can be
turned by hand without binding, see Fig. 61.
NOTE: If chain is too tight, it will not rotate. Loosen bar nuts
slightly and turn adjusting screw 1/4 turn counterclockwise.
Lift the tip of the guide bar up and retighten bar nuts.
59
en
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