Gravely 420RX Operator's Manual page 26

2. Before installing new filter element, inspect it by
placing a bright light inside and rotate element slowly,
looking for any holes and tears in the paper. Also
check gaskets for cuts or tears. Do not attempt to use a
damaged element. A damaged element will allow
abrasive particles to enter the engine.
3. Install new filter element (item 3) with open end first.
4. Reinstall canister access cover (item 4). Make sure it
seals all around canister body (item 2) before
tightening retaining clips (item 5).
5. Check rubber debris discharge cap (item 6). Clean if
plugged.
6. Check all fittings and clamps periodically for tightness.
Inspect hoses for holes or cracks.
7. Periodically check engine intake hose (item 1) for signs
of ingested dust. Locate and repair source of ingested
dirt.
8. Never operate vehicle without a filter element (item 3).
5
2
8
7
1. Engine Intake Hose
2. Canister Body
3. Filter Element
4. Access Cover
5. Retaining Clip
6. Debris Discharge Cap
7. Hose Clamp
8. Air Intake Coupling
Engine Air Filter Handling
A specially designed dry filter supplies clean combustion air
to the engine.
Prevent costly and non-warrantable premature engine
damage by maintaining the air filter properly. Many engine
problems are due to improper handling of the air filter. Dust
and dirt that gets pass the air filter will damage engine
cylinder, piston and bearings in a few hours.
3
7
1
Figure 18
Prevent costly and non-warrantable premature engine
problems by avoiding the following common mishandling:
• Over servicing
• Improper installation
• Damaged air filtering system
• Incorrect air filter element
Over Servicing
Over servicing occurs when an air filter element is inspected
and/or replaced too often. Dust and dirt can fall off the filter
element onto the canister where it can be sucked into the
intake system. Only a few grams of dirt getting into an
engine during each filter inspection can prematurely produce
dust ingested engine problems.
A partially dirty air filter element is not harmful to the engine
as long as the air flow to the engine is not restricted.
The air filter element should be changed before it becomes
too dirty and restricts air flow to the engine hindering its
performance. Replace air filter element immediately should
this happen. Engines that do not get proper amounts of air
will draw in excessive amounts of gas causing premature
engine problems.
2
The frequency of needing to change the air filter is largely
determined by driving conditions. Dusty conditions will
require more frequent servicing.
4
A dirty filter element should always be replaced with a new
element. Improper cleaning procedures can get dust on the
inside of the filter causing dirt ingestion and engine
problems.
Improper Installation
Improper installation occurs when dust leaks past the seals.
The filter element must be aligned within the canister and
properly seated on both ends to prevent dirt from entering
the engine.
Damaged Air Filtering System
A damaged air filtering system often occurs from
6
mishandling the filter element and driving the vehicle in
areas that could damage the canister.
Banging and/or bumping the filter element against a solid
object such as a tire or blowing the element with air can
damage the seals and/or force dust and dirt particles
through the filter media creating a hole for dirt to pass
through to the engine.
Driving the vehicle carelessly over rough terrain, jutting
sticks, heavy brush and severe rocks can damage the air
cleaner canister. Periodically inspect the air cleaner canister
for external damage and replace if necessary.
GB - 26