Ryobi RY13050 - Manual (Page 15)

11 — English
MAINTENANCE
 Remove the air filter.
 Clean the foam filter element with warm soapy water.
Rinse and let dry.
NOTE: If the foam filter element is damaged, it should be
replaced.
 Apply a light coat of engine oil to the foam filter element,
then squeeze it out.
 Reinstall the air filter.
NOTE: Make sure the filter is seated properly inside the
cover. Installing the filter incorrectly will allow dirt to enter
the engine, causing rapid engine wear.
 Reinstall the cover and tighten knob to secure.
FUEL CAP
WARNING:
Check for fuel leaks. A leaking fuel cap is a fire hazard
and must be replaced immediately. If you find any leaks,
correct the problem before using the product. Failure
to do so could result in a fire that could cause serious
personal injury.
The fuel cap contains a non-serviceable filter and a check
valve. A clogged fuel filter will cause poor engine perfor-
mance. If performance improves when the fuel cap is loos-
ened, check valve may be faulty or filter clogged. Replace
fuel cap if required.
SPARK PLUG REPLACEMENT
This engine uses a Champion RY4C spark plug with .025 in.
electrode gap. Use an exact replacement and replace
annually.
CHANGING ENGINE LUBRICANT
See Figure 16.
For best performance, engine lubricant should be changed
after every 25 hours of operation.
To change the engine lubricant:

Stop the engine and disconnect the spark plug wire. Allow
the engine to cool completely before proceeding.
 Remove the oil fill cap/dipstick.
 Tip the unit backward so the handles rest on the ground
and allow lubricant to drain from the oil fill hole into an
approved container.
NOTE: Drain the lubricant while the engine is still warm
but not hot. Warm lubricant will drain quickly and more
completely.
 Return the unit to an upright position and refill with lubri-
cant following the instructions in the Adding/Checking
Engine Lubricant section previously in this manual.
NOTE: Used lubricant should be disposed of at an approved
disposal site. See your local retailer for more information.
CHANGING EDGER BELT
See Figure 17.
The belt was designed to surpass the life of the unit, however,
if you find a need to replace the belt, instructions are given
below. Changing the belt requires disassembly of the drive
unit. If you are unsure if you are qualified to perform this
operation, take the unit to an authorized service center.

Remove blade and blade nut according to Replacing the
Blade.
 Use a flat head screwdriver to remove screws from ring
washer and blade guard. Remove ring washer and blade
guard.
 Use a T25 Torx key, remove the screws from the belt
cover. Remove the belt cover.
 Using M10 and M8 wrenches, remove hex nuts and bolts
gear/shaft assembly. Remove gear/shaft assembly.
 Replace belt.
 Reassemble in reverse order. Tighten all hardware se-
curely.
WARNING:
Ensure all components are completely and properly re-
assembled before operating edger. Failure to correctly
reassemble all belt components may result in serious
injury or property damage.
ADJUSTING CAMSHAFT-TO-ROCKER ARM
CLEARANCE
See Figures 18 - 20.
Inspect the camshaft-to-rocker arm clearance after every
25 hours of operation. This should be done in a clean, dust-
free environment.
NOTE: This procedure requires partial disassembly of the
engine. If you are unsure if you are qualified to perform this
operation, take the unit to an authorized service center.

Stop the engine and disconnect the spark plug wire. Allow
the engine to cool completely before proceeding.
 Remove the screw from the top engine cover. Remove
engine cover and set aside.
 Using a Torx screwdriver, remove the screw from the
rocker arm cover. Remove the cover and set aside.
 Position camshaft by pulling the recoil starter grip just
until the deep hole in the camshaft gear is located at the
6 o’clock position as shown.
 Place the feeler gauge under each rocker arm and measure
the gap. The gap should be between .006 in. (0.15 mm)
and .008 in. (0.20 mm) for both rocker arms.
NOTE: Use a standard automotive feeler gauge. The
.006 in. (0.15 mm) feeler gauge should slide between
the rocker arm and valve stem with a slight amount of
resistance but without binding. The 0.008 in. (0.20 mm)