Tachometer-Hourmeter Adapter

b. Cleaning and Inspection.

a multimeter or test lamp. Replace defective switches.

(4) Inspect the starter disengage relay for

WARNING

cracks, dented housing, loose or damaged terminals,

and other damage. The relay is a normally closed

Clean all parts in a well-ventilated area.

switching device.

Apply 24 volts across the coil

terminals and check for continuity across the contact

Avoid inhalation of solvent fumes and

terminals. No continuity should exist while power is

prolonged exposure of skin to cleaning

applied.

Disconnect the 24-volt input to the coil

solvent. Wash exposed skin thoroughly. Dry

terminals. There should now be continuity across the

cleaning solvent (fed. spec. P-D-680) used to

contact terminals when the coil is deenergized. Replace

clean parts is potentially dangerous to

a damaged or inoperative relay.

personnel and property. Do not use near

c. Reassembly and Installation.

open flame or excessive heat. Flash point of

(1) Reassemble and install the controls and

solvent is 100 to 138 F (38 to 59 C).

indicators on the control panel as shown in figure 4-27.

(1) Clean all parts by wiping them with a cloth

(2)

Connect the electrical leads to the

dampened lightly with dry cleaning solvent (fed. spec. P-

components as shown in figure 1-4.

D-680); take care to prevent the solvent from entering

the interior of the components.

4-45. Tachometer-Hourmeter Adapter

(2) Inspect all meters and gages for cracked

a. Removal.

dial glass, defaced or illegible dial marking, sticking or

(1) Disconnect the tachometer shaft (1, fig. 4-28) from

binding dial pointers, damaged terminals, evidence of

both the tachometer-hourmeter (2) and from the

entry of moisture, and other damage.

Replace

adapter (3)

on the overspeed governor drive

damaged gages and meters.

mechanism

(3) Check all switches for cracked cases,

difficult operation, lack of positive switch action, and

other damage. Check the switches for continuity, using

4-47