Exmark 4500-352 Adjustments, Thread Locking Adhesives, Mobil HTS Grease Or Food-Grade Anti-seize

Maintenance

Thread Locking Adhesives

Thread locking adhesives such as “Loctite 242” or “Fel-Pro, Pro-Lock Nut Type” are used on the following fasteners:

•All belt drive pulley setscrews.

•OPC lever setscrews.

•Pulley retaining bolt in end of engine crankshaft.

•Fuel tank bulkhead fitting threads

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

•OPC lever hubs and cross-shaft

Note: Care must be used not to bond the bearing, next to each OPC hub, to the cross-shaft which could cause binding of the OPC levers and erratic operation.

•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.

Copper-Based Anti-seize

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

•Between the blade drive and transmission drive pulleys and engine crankshaft.

•Between the transmission drive pulley and transmission drive shaft.

•Between the bearings and sheaves and transmission output shafts.

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.

Adjusting the Cutting Height

The cutting height of the mower deck is adjusted from 1 inch to 4 1/4 inches (2.54 cm to 11.4 cm) in 1/4 inch (.64 cm) increments by adjusting the axle position, number of spacers below the caster hub, and number of spacers between blade and spindle.

Refer to the Cutting Height Adjustment table and select a cutting height range in the left hand column which corresponds to the range of cutting heights you will most often be using. Adjustments within this range can then be made by adjusting the number of blade spacers between the blade and the bottom of the spindle (this is a much easier adjustment to make than adjusting axle position and number of spacers below caster support hub).

Note that:

•For the best cut and discharge, place a minimum of two spacers between the blade and the spindle.

•For highest quality cut, place all four spacers between the blade and the spindle.

•If mulching kit is installed, the highest quality cut can be obtained with 3 spacers between the blade and the spindle (minimum is 1 for a good cut).

•When mulching leaves it is best to have fewer spacers between blade and spindle.

Refer to the table and select desired cutting height range. Refer to Adjusting the Axle Position,

Adjusting the Number of Spacers below Caster Support Hub, and Adjusting the Cutting Height with Blade Spacers and sections to make adjustments make adjustment to obtain specific cutting height.

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