RIDGID GP80150RT Operator's Manual page 18

MAINTENANCE
CHANGING THE ENGINE OIL
See Figure 27, page 27.
Replace the engine oil after the first 100 hours of operation
and every 100 hours following the first oil change.
 Turn off the air compressor.
 Place a suitable container underneath the drain hole to
collect used oil.
 Remove the drain line cap with an adjustable wrench.
 Allow lubricant to drain completely.
NOTE: Drain the lubricant while the engine is still warm
but not hot. Warm lubricant will drain quickly and more
completely.
WARNING:
Do not change engine lubricant while it is hot.
Accidental contact with hot engine lubricant could
result in serious burns.
 Reinstall the cap and tighten with the wrench.
 Remove the engine oil cap/dipstick.
 Refill with lubricant following the instructions in the
Adding/Checking Engine Oil section. For amount of oil
needed to refill, see Product Specifications earlier in this
manual or the accompanying engine manual, if applicable.
 Reinsert the oil cap/dipstick securely into the oil fill hole.
NOTE: Consult hazardous waste management guidelines in
your area for the proper way to dispose of used oil.
CHANGING THE PUMP OIL
See Figure 28, page 28.
 Turn off the air compressor.
 Place a suitable container underneath the drain plug to
collect used pump oil.
 Loosen the pump oil cap/dipstick. Remove the drain plug
and washer and drain the old pump oil.
NOTE: Drain the oil while the pump is still warm but not
hot. Warm oil will drain quickly and more completely.
 Replace the drain plug and washer. Tighten securely.
 Refill with pump oil following the instructions in the
Adding/Checking Pump Oil section.
 Replace pump oil cap/dipstick and tighten securely.
NOTE: Consult hazardous waste management guidelines in
your area for the proper way to dispose of used oil.
SPARK PLUG MAINTENANCE
See Figures 29 - 30, page 28.
The spark plug must be properly gapped and free of deposits
to ensure proper engine operation. To check:
 Turn off the air compressor.
 Remove the spark plug cap.
 Clean any dirt from around base of spark plug.
 Remove spark plug using the spark plug wrench provided.
 Inspect spark plug for damage, and clean with a wire
brush before reinstalling. If insulator is cracked or chipped,
spark plug should be replaced. For replacement spark
plug, see Product Specifications earlier in this manual
or the accompanying engine manual, if applicable.
 Measure plug gap. The correct gap is 0.023−0.027 in.
(0.6 mm - 0.7 mm). To widen gap, if necessary, carefully
bend the ground (top) electrode. To lessen gap, gently
tap ground electrode on a hard surface.
 Seat spark plug in position; thread in by hand to prevent
cross-threading.
 Tighten with an adjustable wrench to compress washer.
If spark plug is new, use 1/2 turn to compress washer
appropriate amount. If reusing old spark plug, use 1/8 to
1/4 turn for proper washer compression.
NOTE: An improperly tightened spark plug will become
very hot and could damage the engine.
BELT REPLACEMENT
See Figures 31 - 35, pages 28 - 29.
The air compressor is powered by a belt-driven motor.
Periodically check the belt for wear and replace it when
necessary. Proceed as follows when replacement is required:
 Turn off the air compressor and disconnect the spark plug
wire. Allow the engine to cool.
 Remove the removable tank following instructions in
Removable Tank Alone — Regulated Carry Tank For
Small Jobs and set aside.
 Using an adjustable wrench, remove the following bolts,
washers, nuts, and spacer securing the belt guard:
• one M10 flange hex hd. bolt, lock washer, flat washer,
and spacer from the top of pump
• two M6 soc. hex hd. bolts, lock washers, and square
washers from the ends of the belt guard
• four M6 flange hex hd. bolts, lock washers, flat
washers, and nuts on the sides of the belt guard
 Carefully lift the belt guard off the air compressor and set
aside.
 Loosen the four engine bolts and nuts securing the engine
in place.
 Turn the belt tensioner bolt counterclockwise to move
the engine toward the pump until there is enough slack
in the belt for it to be removed from around the pulleys.
 Place the new belt around the small pulley (narrow side
down), then install the belt over the large pulley.
 Turn the belt by hand until you are certain it is properly
aligned on the grooves of the pulleys.
 Turn the belt tensioner bolt clockwise to move the engine
away from the pump until there is tension in the belt.
18 – English