Craftsman 351.21 4300 operating instructions Possible Causes, Corrective Action

SYMPTOM

Motor running too hot

POSSIBLE CAUSE(S)

1.Blade tension too great

2.Blade too coarse for work (typical when cutting pipe)

3.Blade too fine for work (typical when cutting slick or soft material)

4.Excessive dirt and chips

CORRECTIVE ACTION

1.Reduce tension on blade

2.Use blade with finer teeth

3.Use blade with coarser teeth

4, Clean thoroughly; vacuum motor and speed change mechanism

Saw will not start	1,	Key switch	not on	1.	Turn key to on
	2.	Not plugged	in	2.	Plug into supply
	3.	Loose electrical connections		3.	Have	qualified	electrician check electrical
					connections
	4,	Thermal overload relay tripped		4.	Reset	relay, see "Grounding Instructions"
	5.	Fuse blown		5.	Check	and replace fuse
Speed difficult adjust	1.	Motor not running		1.	Turn saw on
	2.	Worn/Broken V-belt(s)		2.	Check/Replace		V-belts for Repair Part,
					See Figure 17.

Blade does not heat up when weld button is pressed

1, No power to welder 1. Check power at receptacle

2.Weld pressure adjustment not reset 2. Adjust weld pressure properly

3.Weld pressure adjustment set to "0" 3. Adjust weld pressure properly

4.	Blade	or jaws dirty, rusty or oily	4.	Clean	blade and jaws
5.	Loose	connection to weld switch,	5.	Check;	tighten if necessary
	limit switch, transformer,
	or welder jaws
6,	Burnt	transformer	6.	Replace

Misaligned

weld

1.

Dirt or scale on jaws or blades

1.

Clean jaws

and blades

2.

Blade ends not cut square

2.

Cut

ends square

3.

Blade ends not correctly

3.

Clamp blades

against jaw alignment surface

aligned when clamped in jaws

4,

Worn jaws

4.

Replace

Blade

ends overlap

1.

Improper

weld pressure

1.

Reduce weld

pressure

2.

Blade ends aligned incorrectly

2.

Align blades

properly

Incomplete

weld

1.

Weld pressure adjusted

incorrectly

1.

See

"Blade

Welding"

2.

Improper

clamping

2.

See

"Mounting

Blade"

3.

Defective

limit switch

3.

Replace

4.

Movable

jaw sticking

4.

Clean and

oil jaw dovetails

on inside

of cabinet

Weld

breaks when

used

1.

Weld not annealed correctly

1.

See

"Blade Annealing"

2.

Weld ground too thin

2.

Grind weld

to thickness of blade

3.

Incomplete weld

3.

See Incomplete Weld section (above)

Blade

melts when

welding

1.

Weld pressure adjusted

incorrectly

1.

Increase weld

pressure

2.

Inaccurate moveable jaw

retraction

2.

Allow sufficient

time for tool to cool down;

see "Blade Welding"

3.

Movable

jaw sticking

3.

Clean and

oil jaw dovetails

on inside

of cabinet

Brittle

welds

1.

Weld not annealed correctly

1.

See "Blade

Annealing"

2.

Dirt, oil or flash on blade or jaws

2.

Clean blade

and jaws

13