Gravely 420RX Operator's Manual page 27

Incorrect Air Filter Element
The air filter must remain intact to block passage of dirt and
foreign particles. It must be of sufficient size and
construction to withstand stresses, caused by rapid cycling
of air volume demanded by the engine, without cracking or
tearing under fatigue and pressure. Its filter elements must
have the correct media composition, filter area, micron size
and dimensions to properly filter the air of dirt while at the
same time passing sufficient air to the engine.
CVT Breather Hose
1. The inlet port for the CVT breather hose is located on
the right side of the unit just behind the fuel tank.
Ensure that the slotted opening stays clean and clear
of debris.
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1. CVT Breather Hose Inlet
2. CVT Breather Hose
Exhaust System
Prevent exhaust fires. Clean exhaust system daily while cold
of all dirt and trash. Check exhaust system often for
cleanliness especially while traveling over areas that
produce high amounts of airborne combustible materials.
Figure 19
Parking Brake Adjustment
When adjusted properly, the parking brake will prevent the
vehicle from rolling when the shift lever is in neutral.
IMPORTANT: Make certain the wheels are chocked and the
cargo bed is securely supported in the up position before
working on the parking brake.
1. Park vehicle on a level surface. Do not work under or
around a vehicle parked on an incline.
2. Set shift selector in Neutral.
3. Chock front and back of rear wheels.
4. Secure cargo bed in the up position.
5. Turn ignition switch off and remove key.
6. Ensure that parking brake lever is fully released
position.
7. Remove hex bolt and nut (item 1) retaining parking
brake yoke (item 2) to brake lever assembly (item 3).
Retain hardware.
8. Loosen jam nut (item 7).
9. Allow the brake lever assembly to seat itself in the ball
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detent (item 4). Ensure that lever assembly is fully
seated.
10. Adjust yoke in or out until yoke holes align with hole in
brake lever assembly.
11. Install hex bolt and nut and tighten.
12. Tighten jam nut against yoke.
13. Check parking brake adjustment:
a. Engage parking brake lever fully and check that the
brake pads are seated tightly against the brake disc.
The vehicle should not move with parking brake
engaged.
b. Release the parking brake and check that the brake
pads do not contact the brake disc.
c. If necessary, additional adjustment can be made at
the parking brake lever. Loosen the jam nuts and
adjust the cable tension in or out to achieve the
desired tension. Tighten the jam nuts.
14. Engage the parking brake, lower cargo box and
remove wheel chocks.
GB - 27