GE GE752 manual Inspection Monthly, Covers, Seals, Latches, Brushholders Fig

GEK±91584D, Vertical Drilling Motor, Type GE752

INSPECTION

MONTHLY

Inspect the exterior of the machine, including cables, for damage.

Covers, Seals, Latches

Clean the outside of the machine and remove the in- spection covers. Use clean, dry compressed air and blow the dirt and carbon dust from the interior of the ma- chine.

WARNING: When using compressed air for clean- ing purposes, flying debris and particles may present a hazard to personnel in the immediate area. Personnel should be provided with, and trained in the use of, personal protective equip- ment as specified by applicable federal or state safety regulations.

Check exterior covers to be sure felt seals are intact. If seals are missing or covers are damaged, replace seals or covers as necessary. Make sure covers fit prop- erly and cover latches work properly.

Brushholders (Fig. 5)

Satisfactory operation of the drilling motor requires the brushholders to be in good condition. Of particular importance is the inside dimension of the carbonways. Operation may also be impaired by brushholders which have been mechanically damaged or sustained dam- age as the result of motor flashovers.

Inspect the brushholders for damage. If they require replacement, refer to BASIC REPAIRS, Brushholder Replacement section for instructions.

When new, brushholder carbonways should mea- sure 0.753 +/±0.002 in x 2.2575 +/±0.0025 in. If or when the 0.753 in. dimension exceeds 0.765 in., the brushhol- der should be scrapped. If it falls between 0.758 and 0.765 in., the carbonway can be restored to its proper dimension according to the following instructions:

1.Remove the brushholder. Position it as shown in Fig. 3 and tap the metal ridge with a hammer.

FIG. 3. RESIZING BRUSHHOLDER

CARBONWAYS. E±11281.

Start at one end and work along the ridge to the other end.

2.Check progress frequently by means of a ªGo/ No±Goº gage made to the dimensions shown in Fig. 4.

FIG. 4. BRUSHHOLDER CARBONWAY

GAGE. E±11283A.

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