Lyman Mag 20 Furnace Instructions Manual

Mag 20 Furnace Assembly, Operation and Parts
Assembly
The main body of your furnace is fully assembled and factory-tested. To facilitate packag-
ing, the valve rod and operating lever have not been factory-installed and you must do so,
prior to using the furnace as follows: Attach the operating lever spring to the operating lever.
Slide the valve rod on the operating lever as shown in Figure 19. Next, place the valve rod
and operating lever, into position as shown in Figure 20. Fasten the operating lever...

Safety Precautions:
1) No casting should be done without basic safety garb. This would include long pants and long sleeves, sturdy
gloves, eye protection and closed top shoes.
2) Keep all flammable items away from casting area. Do not operate unit on flammable materials such as paper,
wood or carpeting.
3) Casting should be done in a well ventilated area. Avoid breathing fumes and dust from furnace.
4) Never allow moisture near molten lead. When moisture is introduced to molten lead, a terrific steam...

When replenishing a near-empty pot, there is no need to adjust the control knob since the
furnace automatically increases its heating efforts until the designated pot temperature is
reached. The blinking pilot light indicates the furnace is at temperature.
The bottom pour spout valve system of the furnace has been designed to provide efficient
trouble-free casting. Valve leakage is usually caused by dirt and grit, suspended in the molten
metal, jamming the valve partially open.
Opening that valve to...

there is about 1/4 between the pouring spout of the furnace and the top of the mould block. Tighten the
elevation adjustment screws against the support posts so the mould guide will remain in this position.
To align the sprue hole in the mould with the pouring spout on the furnace, you must
loosen the carriage bolt in the adjustable mould guide slide. Loosening this bolt will allow the
adjustable slide to be moved backward and forward. This also allows the horizontal alignment
of the track. On multiple...

1020
21
22
23
24
25
26
27
28
MAG 20 (upper)
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See Page 63 for parts Description 

11
12
4
13
14
15
16
17
18
193335
3436 3712
29
30
31
32
16
29
12
MAG 20 (lower)
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MAG 20 PARTS LIST
1Lever Stud* 2999081
2Rd. Hd. Screw #6-32 x 5/8** 2800029
3Limit Screw** 2999092
4Hex Bolt 
1⁄4-20 x 1” (4)* 2800079
5Valve Guide Plate* 2999080
6Inner Pot* 2800074
7
1⁄4-20 Hex Nut* 8094080
8Self Tapping Screw (8)* 2800080
9Upper Body* 2800081
10 Heating Element 110V* 2800073
11 Probe Retainer* 2800084
12 Hex Nut 10-24 (6)* 03324R
13 Lower Body* 2800086
14 Carriage Bolt** 2990503
15 Adjusting Slide** 2990502
16 Lower Post (3)* 2800004
17 Washer** 03236R
18 Base* 2800087
19 Hex Bolt...