Exmark 920 manual Adjustments, Mobil HTS Grease Or Food-Grade Anti-seize, Copper-Based Anti-seize

Maintenance

•Fuel tank bulkhead fitting nuts.

•Bolts retaining stub shaft to engine flywheel.

Adhesives such as “Loctite RC/609 or RC/680” or “Fel-Pro Pro-Lock Retaining I or Retaining II” are used on the following:

Fuel tank studs, where studs are inserted into tank.

Mobil HTS Grease (Or Food-Grade Anti-seize)

Mobil HTS grease (or food-grade anti-seize) is used in the following locations:

•Between the cutter housing spindle and bearings.

•Between the cutter housing spindle and sheave.

•Under top cutter housing bearing guard.

•Between the jackshaft and bearings and the jackshaft and sheaves.

Copper-Based Anti-seize

Copper-based anti-seize is used in the following location:

On threads of Blade Bolts. See Check Mower Blades section.

Dielectric Grease

Dielectric grease is used on all blade type electrical connections to prevent corrosion and loss of contact.

Adjustments

Note: Disengage PTO, shut off engine, wait for all moving parts to stop, engage parking brake, and remove key before servicing, cleaning, or making any adjustments to the unit.

CAUTION

Raising the mower deck for service or maintenance relying solely on mechanical or hydraulic jacks could be dangerous. The mechanical or hydraulic jacks may not be enough support or may malfunction allowing the unit to fall, which could cause injury.

Do Not rely solely on mechanical or hydraulic jacks for support. Use adequate jack stands or equivalent support.

Deck Leveling

1.Position mower on a flat surface.

2.Stop engine, wait for all moving parts to stop, and remove key. Engage parking brake.

3.Check tire pressure in drive tires. Proper inflation pressure for tires is 10 psi (69 kPa). Adjust if necessary.

4.Set anti-scalp rollers to top holes or remove them completely for this adjustment.

5.Raise the deck to the 5 inch (12.7 cm) height position (also transport position) and take all force off of the two large deck lift springs by loosening the nuts at the front of each spring (Figure 17).

6.Lower the deck to the 1 inch (2.54 cm) height position. Force the left rear deck support arm downward about 1/4 inch (6.4 mm) to get the deck to rest at the 1 inch height position. Place locking pliers between the rear swivel and spring stop to hold the deck in this position (Figure 17).

7.Place a 3/4 inch (19 mm) thick block of wood under each of the two rear anti- scalp roller brackets and place one under one of the front center anti-scalp roller brackets.

8.Loosen the two top chain bolts in slots in the rear deck lift arms. Loosen jam nuts and back off the socket head adjusting screws on the bottom of the arms until the chains are just loose. Turn the socket head adjusting screws in until slack is taken out of each chain. Tighten the jam nuts. Tighten

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