TM 55-4920-244-14
(2) Remove hinge pin (10) and re-
4-28. Potentiometer (%RPM) (Figure 4-8).
move lid.
a. Removal.
(3) Remove rack (11) by removing
(1) Remove deck assembly (para. 4-
attaching screws and washers.
c. Cleaning. Clean all parts of probe stor-
(2) Remove rpm check assembly
age compartment assembly with dry cleaning sol-
vent (item 1, table 1-1).
(3) Identify and tag wiring. Unsol-
d. Inspection and Repair.
der and remove wiring from potentiometer (61).
(1) Inspect interior and exterior of
(4) Remove screws (62) and lock-
probe storage compartment (14) and lid (5) for
washers (63) which secure potentiometer to deck.
dents, misalignment, condition of paint, and cor-
Remove potentiometer.
rosion.
(2) Inspect hinge pin (10) for cor-
NOTE
rosion, deep scoring, and damage. Replace if de-
Remove gasket (0 ring)
fective.
only if damaged.
(3) Inspect stop arm (9) for mis-
alignment and excessive wear.
b. Disassembly and Repair. No disassem-
(4) Inspect rack (11) for damage,
bly or repair is required. Replace on an as re-
misalignment, condition of paint, and corrosion.
quired basis.
(5) Dents in lid, probe storage com-
partment, stop arm, and rack are permissible,
4-29. Probe Storage Compartment Assembly
providing they do not affect the alignment,
rigidity, or utility of the component. Remove
The probe storage compartment assembly
dents and restore alignment using an arbor
provides compact storage facilities for the heater
press or other suitable equipment.
probes. The interior of the probe storage com-
(6) Remove corrosion and scratched,
partment and the probe rack allows storage of
peeling, or deteriorated paint with a suitable
hot heater probes without prior cooling. Two
abrasive such as abrasive paper (item 3, table 1-
trunk-type latches and a stop arm are provided
1). Coat exposed surfaces to be painted with zinc
to secure the lid in either the closed or open
chromate primer (item 4, table 1-1), and allow to
position.
dry. Repaint in accordance with TM 43-0139.
a. Removal.
Mask off loops in hinges, threaded holes, and
(1) Unlatch and raise probe storage
other working surfaces.
compartment (6).
(7) Replace stop arm if slide on up-
(2) Properly support probe storage
per end is damaged or worn so that it will not
compartment (6) and remove screws (30) and
operate properly.
stop arm supports (9) from stop arms (8).
(8) Replace screw and spacer if
thread damage or other condition is evident that
CAUTION
would cause improper operation.
Before removing the probe
(9) Replace hinges, latches, or tracks
storage compartment (6),
that are defective or damaged beyond economical
insure that it is properly
repair.
supported to prevent dam-
age to the base assembly
4-30. Handle Assembly.
(29).
The handle assembly is constructed of
rigid metal tubing and is attached to the tester
(8) from
(3) Remove stop arms
with a ratchet-type pivot socket at each side to
tracks.
(4) Remove hinge pin (32) from
provide positive locking at regular intervals. The
probe storage compartment hinge and lift probe
handle is locked in the desired position by
tightening wing nuts located at the pivot axis.
storage compartment (6) from base assembly
(29).
(1) Remove wing nuts (25) from
b. Disassembly.
bolts (26).
(1) Remove screws (8), stop arm
(2) Remove handle assembly from
support (6), and spacer (7). Remove stop arm
tester by springing handle (31) over bolts (26).
(9) from track in lid (5).
