TM 9-4940-660-14&P
(12) Loosen cable clamp (29) and remove leads from cable
a s s e m b l y (30) to switch (27).
Remove cable (30).
(13) Remove Switch ring nut and remove switch (27) and
insulator ( 2 8 ) .
(14) Remove
screw
handle
(31)
from
housing
(32).
c.
Inspection
(1)
Replace
hardware
with
stripped
threads.
(2) Replace mica sheets (20) w h e n e v e r t h e y a r e r e m o v e d .
(3) Replace cover (14) and housing (32) if they are
cracked.
(4) R e p l a c e c o m p o n e n t s d e t e r m i n e d t o b e d e f e c t i v e b y p a r a 9 .
Assembly is essentially the reverse of disas-
d. Assembly.
embly, keeping in mind the following important techniques:
(1) When replacing leads to electrical components check the
schematic/wiring inset of Fig. 2 and identifying tags on
each lead.
(2)
Stagger mica insulation sheets (20, Fig. 2) to completely
Wrap the sheets around
insulate the heater element (19).
the heater element before installing cover (14) and
Place nozzle over the h e a t e r e l e m e n t a n d
Nozzle (6).
mica carefully.
Do not tear the mica insulation.
(3) After the gun has been reassembled, check air flow dis-
tribution by running the gun in HEAT and observing the
color of the element on both sides o f t h e c e r a m i c . I f
one side is m u c h b r i g h t e r t h a n t h e o t h e r , r e p o s i t i o n
mica after nozzle has cooled.
9.
Service Troubles and Remedies
TROUBLE
CAUSE
REMEDY
Gun plugged in but D e f e c t i v e p o w e r c a b l e .
R e p l a c e (30, Fig.2)
does not o p e r a t e
Defective switch.
Replace (27).
Defective wiring.
Check wiring (Fig.2)
Replace wheel (15)
Defective blowers
Heater element
Check motor speed with
overheats
Insufficient air flow
hand tachometer in COOL
If low, re-
position.
place (26).
Improperly installed
Install mica (20) pro-
or defective mica
perly, para 8, or re-
place if defective
Gun does not heat Defective heater
Replace (19)
Check and tighten loose
Loose hardware.
Unit
rattles
hardware.
6
