Lincoln Electric IM581 Bearing Maintenance, Commutator and Brush Maintenance, Cooling System

D-2 MAINTENANCE D-2

BEARING MAINTENANCE

This welder is equipped with a double-shielded ball bearing having sufficient grease to last indefinitely under normal ser- vice. Where the welder is used constantly or in excessively dirty locations, it may be necessary to add one-half ounce of grease per year. A pad of grease one inch wide, one inch long and one inch high weighs approximately one-half ounce. Over greasing is far worse than insufficient greasing. When greasing the bearings, keep all dirt out of the area. Wipe the fittings completely clean and use clean equipment. More bearing failures are caused by dirt introduced during greasing than from insufficient grease.

COMMUTATOR AND BRUSH MAINTENANCE

WARNING

Uncovered rotating equipment can be dangerous. Use care so your hands, hair, clothing or tools do not catch in the rotating parts. Protect yourself from particles that may be thrown out by the rotat- ing armature when stoning the commutator.

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The generator brushes are properly adjusted when the welder is shipped. They require no particular attention. DO NOT SHIFT THE BRUSHES or adjust the rocker setting.

Shifting of the brushes may result in:

-Change in machine output

-Commutator Damage

-Excessive brush wear

Periodically inspect the commutator, slip rings and brushes by removing the covers. DO NOT remove or replace these covers while the machine is running.

Commutators and slip rings require little attention. However, if they are black or appear uneven, have them cleaned by an experienced maintenance man using fine sandpaper or a commutator stone. Never use emery cloth or paper for this purpose.

NOTE: If the welder is used in dirty or dusty locations, or if the welder is not used for prolonged periods of time, it may be necessary to clean the commutator and slip rings more often.

Replace brushes when they wear within 1/4" of the pig- tail. A complete set of replacement brushes should be kept on hand. Lincoln brushes have a curved face to fit the commutator. Have an experienced maintenance man seat these brushes by lightly stoning the commu- tator as the armature rotates at full speed until contact is made across the full face of the brushes. After stoning, blow out the dust with low pressure air.

To seat the slip ring brushes, position the brushes in place. Then slide one end of a piece of fine sandpaper

between slip rings and brushes with the coarse side against the brushes. With slight additional finger pres- sure on top of the brushes, pull the sandpaper around the circumference of the rings, in direction of rotation only - until brushes seat properly. In addition, stone slip ring with a fine stone. Brushes must be seated 100%. Arcing or excessive exciter brush wear indicates a possible misaligned shaft. Have an authorized Field Service Shop check and realign the shaft.

COOLING SYSTEM

The SAE400 WELD’N AIR is equipped with a pressure radiator. Keep the radiator cap tight to prevent loss of coolant. Clean and flush the cooling system periodi- cally to prevent clogging the passage and overheating the engine. When antifreeze is needed, always use the permanent type.

ENGINE AND	COMPRESSOR	MAINTENANCE
COMPONENTS
ITEM	MAKE	PART NUMBER
Engine Air Filter	Donaldson	P181052
Fan Belt	Lincoln	S19730
	Gates	8129
Compressor Belt	Lincoln	S23887
	Gates	2/A40
Fuel Filter	Perkins	26561117
Engine Oil Filter	Perkins	2654403
REPLACING AIR COMPRESSOR DRIVE BELT
	CAUTION
Belt is tensioned using a automatic tensioning device.
Remove with care.
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To remove compressor belt:

1.Remove nut and lock washer from lower locking bolt on idler tension flange.

2.Loosen center mounting bolt on idler tensioner 1/2 turn or until it moves freely.

3.Using a pipe wrench or equivalent tool, turn ten- sioner body slightly to free locking bolt. Remove locking bolt and slowly release tension on belt. Remove belt.

Note: Do not loosen or remove compressor mounting bolts. Pulley misalignment may result.

To install belt (after following above procedure):

1.Mount belt into pulley grooves and over idler pul- ley.

2.Using a pipe wrench or suitable tool, turn idler body to realign locking slot in idler flange with lock- ing hole. Insert locking bolt and tighten before releasing idler body. Tighten center mounting bolt.

Note: Ensure that both belt strands are running prop- erly in pulley grooves.

SAE400 WELD’N AIR