Load resistor internal repair, Removing the resistor main housing, Removing the resistor inspecting the resistor – Bird Technologies 8650B Series User Manual

Page 35

Maintenance

Load Resistor Internal Repair

The water cooled load used in the Moduload is designed to be quickly and eas-
ily repaired in the field. If in performing the DC resistance check ("Measuring
DC Resistance" on page 16), significant changes in resistance are noticed or if
for any reason the resistive element should fail, replacement resistors are
available. See “Replacement Parts List” on page 31.

Removing the Resistor Main Housing

Removing the Resistor

Note:

The inner flow tube will usually come out with the water

chamber assembly being held to it by the compression of the inner O-

Ring water input seal. This is normal and if the resistor body is unbro-

ken there will be no need to remove the inner flow tube from the water

chamber assembly.

Note:

The ground cap assembly is fitted tightly within the water

chamber and should normally remain with it. If the ground cap is still

on the end of the resistor, remove it before proceeding.

1. Do one of the following:

If the inner flow tube has stayed in the resistor section:
a. Grasp the resistor stop sleeve on the flow tube.
b. Pull out the assembly.

Note:

This includes the cushioning O-Ring which fits loosely

below the stop sleeve.

Note:

Do not lose the O-Ring.

If the brass resistor sleeve is removed:
Notice that it has a small escape hole at the side, and an access coun-

terbore leading to it.

Note:

In reassembly, be sure this counterbore is facing toward the O-

Ring and the resistor. It is necessary for internal water venting. The water

outlet holes, and also the small shoulder at the base of the inner flow tube,

must fit into the mating recess in the input fitting at the bottom.

If the resistor is intact:
a. Pull it straight out of the load housing.

Note:

The outer flow tube is captive and will not come out of

the housing at this stage.

Inspecting the Resistor

If the resistor has been successfully removed, inspect it to make sure it has

not been fractured. In most cases, even in the event of a resistor failure, the

resistor substrate will remain intact. Also, examine the inside of the load

housing assembly for any visible damage to the internal parts.
If no damage is found, continue with Resistor Replacement.
If the resistor is broken, other internal parts appear to be damaged, or if they

do not fit together properly, proceed to Replacement Procedure for Fractured

Resistors.