Reduction Gearbox; Spark Plug Replacement; Cleaning Air Filter - Ryobi RPHD43O Operator's Manual

Stop the engine and allow it to cool before making adjustments or completing any maintenance.
You may make adjustments and repairs described here. For other repairs, have the post hole
digger serviced by an authorised service agent.
Consequences of improper maintenance may include excess carbon deposits resulting in loss
of performance and discharge of black oily residue dripping from the muffler.
Make sure all guards, deflectors and handles are properly and securely attached to avoid the risk
of personal injury.
ENGINE
Clean the cylinder fins with compressed air or a brush periodically. Dangerous overheating of
engine may occur due to impurities on the cylinder.

REDUCTION GEARBOX

See figure 14
Every 100 working hours change the grease in the reduction gearbox.
LUBRICANT FOR REDUCTION GEARBOX
The post hole digger is supplied with TAMOIL TAMLITH GREASE 2 grease in the reduction gearbox.
The lubrication in the reduction gearbox should be checked periodically. To check the lubricant
condition and level, remove the pressure release screw under the reduction gearbox.
The manual specifies "TAMOIL TAMLITH GREASE 2"
This is a Lithium soap based grease with a temperature range of -30 to 130
Castrol L/EPO is a suitable substitute (or equivalent in other brands).
It's a Lithium based semi fluid grease suited to gearboxes and being semi liquid is self-levelling.

SPARK PLUG REPLACEMENT

See figure 15
This engine uses an NGK BPMR6A or Champion RCJ6Y spark plug with 0.60 (+/- 0.1)mm
electrode gap. Use an exact replacement and replace annually. Make sure new spark plug is
secured in place with a torque up to 12N.m.

CLEANING AIR FILTER

See figure 16 & 17
A dirty air filter will cause starting difficulty, loss of performance, and shorten the life span of the
engine. Check the air filter monthly. For best performance, replace the air filter at least once
a year.
Loosen the airbox cover by turning the lock knob counter clockwise.
Remove the airbox cover, air filter retainer and the air filter element.
Clean the foam filter element with warm soapy water. Rinse and let dry.
NOTE: If the foam filter element is damagd, it should be replaced.
Apply a light coat of engine oil to the foam filter element, then squeeze it out.
Reinstall the air filter.
16
o C.