Ryobi PCN 4040 Owner's Operation Manual page 20

MAINTENANCE
In addition, lubricate guide bars (with a sprocket at
their tip) weekly. Using a grease syringe, lubricate weekly
in the lubricating hole.
Turn the guide bar and check that the lubrication holes
(A) and chain groove are free from impurities.
MAINTAINING THE SAFE-T-TIP® NOSE
GUARD (Fig. 62 & 63)
CAUTION
Make sure the chain has stopped before you do
any work on the saw.
WARNING
Although the guide bar comes with a SAFE-T-TIP®
anti-kick-back
you need to check the tightness of the mounting
screw before each use.
Tighten the mounting screw (A) of the nose guard as
instructed below. These are specially hardened screws.
If you cannot install the screw tightly, replace both the
screw and the SAFE-TTIP ® (B) before further operation.
Do not replace the screw with an ordinary screw.
In addition to preventing chain contact with solid objects
at the nose of the bar, the SAFE-T-TIP® also helps keep
the chain away from abrasive surfaces, such as the
ground. Keep it on the right-hand side of the bar where it
will be between the chain and the ground during flush
with ground cutting.
The mounting screw requires a 5/16 in. spanner
(or adjustable spanner) to achieve the recommended
tightness of 4-5 Nm (35 - 45 in. lb.). A tightness within this
range can be achieved by using the following method.
1. Tighten the screw with your finger.
2. Tighten the screw an additional 3/4 of a turn using a
spanner (C).
MOUNTING THE SAFE-T-TIP® NOSE GUARD
(Fig. 62 & 63)
1. Mount the SAFE-T-TIP® on the bar nose.
2. Fit the locking rivet or tab in the recessed hole in the
guide bar.
3. Tighten the screw with your finger.
4. From the finger-tight position, tighten the screw an
additional 3/4 of a turn using a spanner.
device already installed,
English
CLEANING THE AIR FILTER (Fig. 64, 65 & 66)
NOTE: Always clean the air filter before making any
mixture adjustments of the carburettor.
1. For access to the air filter and carburettor area, loosen
the three screws (A) holding the cylinder cover (B).
2. Activate chain brake.
3. Lift the front of the cylinder cover past chain brake lever.
4. Lift the back of the cylinder cover past the handle.
5. Before removing the air filter from the carburettor,
blow or brush as much loose dirt and sawdust from
around the carburettor and chamber as possible.
NOTE: Be sure to pull the choke rod out to keep the
carburettor from being contaminated.
6. Remove the screw (C) securing the air filter (D).
7. Position a flat screw driver between the tabs and twist
as shown in the illustration.
8. Lift the air filter off the air filter base.
Choose one of the following cleaning options:
9. To lightly clean, tap the filter against a smooth, flat
surface to dislodge most saw dust and dirt particles.
10. For a more thorough cleaning, clean in warm soapy
water, rinse, and let dry completely.
NOTE: An alternative method is to clean the filter with
compressed air (always wear eye protection to avoid
eye injury).
11. Reinstall the air filter, making sure that the tabs on the
air filter are located in channels on the air filter bottom
before tightening filter retainer screw.
Clean the pre-filter (D) every 25 tanks of fuel or
sooner, if required. Remove the cylinder cover (B),
starter assembly (E) and the fan housing baffle (F)
for access to the pre-filter in the engine housing.
NOTE: If you use an air hose for drying, blow through
both sides of filter.
CAUTION
Never run the engine without the air filter: serious
damage could result. Make sure the air filter
is correctly placed in the air filter cover before
reassembly.
CLEANING THE STARTER UNIT (Fig. 67)
Use a brush or compressed air to keep the cooling vents
of the starter assembly free and clean of debris.
CLEANING THE ENGINE (Fig. 68 & 69)
Clean the cylinder fins and flywheel fins with compressed
air or a brush periodically. Dangerous overheating of the
engine may occur due to impurities on the cylinder.
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