Drive Belts; Checking Belt Tension; Belt Adjustment; Battery Maintenance - Hobart 60PL20 Operation And Maintenance Manual

OM-2053

8. Drive Belts

A single belt from the crankshaft pulley is used to drive the alternator and water pump. For proper engine
operation this belt should be in good condition and at proper tension at all times.
A. Checking Belt Tension
Check belt tension every 200 hours of engine operation, or bi-weekly. A belt which is too tight is de-
structive to bearings of the alternator and water pump. A loose belt will slip and cause inefficient op-
eration of the alternator and/or the water pump.
To check belt tension, press the belt firmly with the thumb at a point halfway between the alternator
pulley and the crankshaft pulley. A properly adjusted belt should deflect about 3/8 inch.
B. Belt Adjustment
To adjust belt tension, loosen the alternator mounting bolts and change the position of the alternator.
Upon obtaining the correct tension, re-tighten both alternator mounting bolts.
When new belt is fitted, it is necessary to run the engine for a short period to allow the new belt to set-
tle into the grooves of the pulleys and thus show any initial stretching that is going to occur. Recheck
belt tension after running the engine and adjust as necessary.

9. Battery Maintenance

A. General
Two 12-volt batteries supply power for operation of the engine electrical system, clearance and panel
lights, and for flashing the generator exciter field.
B. Battery Location and Accessibility
For location of batteries refer to Section 1-1; Figure 3, Item 2. These batteries are easily accessible by
raising the right rear canopy door of the generator set.
C. Battery Care
(1) Never allow a battery which has been removed from the unit to sit on concrete, ground, or metal
unless proper insulation is provided. A wooden platform or board will provide sufficient insulation.
(2) Maintain stored batteries in a charged condition.
(3) Be sure batteries are fastened securely in their compartment to avoid damage from vibration.
(4) Maintain battery fluid at proper level.
(5) Keep battery terminal posts and lead connectors clean.
WARNING: Never allow sparks or open flame near batteries. Avoid spilling
electrolyte on hands or clothing.
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December 31/91 Revised