GE GE752 manual Armature Assembly Into Frame, CHECK ALIGNMENT OF BEARING AFTER ASSEMBLY. A±120402

Vertical Drilling Motor, Type GE752, GEK±91584D

5.Heat bearing housing (2) in an oven to 100￿ C (212￿ F). While hot, assemble nilos ring (4) (ori- ented as shown in Fig. 40), and the ball bearing

(3) into the housing firmly against the shoulder at the bottom of the bearing fit.

6.Fill all voids in the ball bearing completely with approximately 20.8 oz. of grease. Smear 0.5 oz. of grease on the bearing housing and bearing cap seals, and on the seal ring wear surface on the nilos ring (4).

7.Heat the bearing and housing assembly in an oven to 100￿ C (212￿ F). While hot, assemble it onto the shaft, with the inner race tight against sleeve (13).

CAUTION: Be sure that the nilos ring is assembled over sleeve (13), not pinched between the sleeve and the bearing.

NOTE: Do not heat the bearing and housing as- sembly above 100￿ C (212￿ F). Higher tempera- tures may cause the oil to ªbleedº from the grease.

DIAL INDICATOR	OUTER BEARING
POINTER RESTS
	RACE WITH
AGAINST OUTER
	ROLLERS
BEARING RACE

SUPPORT FOR

INDICATOR ON

ARMATURE SHAFT

INNER BEARING	FRAMEHEAD
RACE

FIG. 37. CHECK ALIGNMENT OF BEARING

AFTER ASSEMBLY. A±120402.

8.Heat spacer (6) to 110￿ C (230￿ F) and shrink it onto the shaft tight against the inner race of ball bearing (3).

The bearing assembly will be completed when the armature is assembled into the frame.

Armature Assembly Into Frame

Models UP and AUP

Refer to Fig. 15.

1.Assemble the brushholders into the frame. Move them well back from commutator to avoid inter- ference when installing the armature. Fasten and insulate the connections and install outgoing cables.

2.Block and level the frame in a vertical position, commutator±end down, on a heavy duty stand. Be sure there is clearance for the commutator± end shaft extension when the armature is low- ered into the frame.

3.Install three guide studs in the commutator±end bearing housing bolt circle to guide the housing into the framehead fit.

4.Pack 5.25 oz. of grease in the outer circumfer- ence of bearing cap (4).

5.Lift the armature with the hoist and lifting bail at the drive end. Line up the hoist directly over the center of the cavity in the frame.

6.Lower the armature slowly into the frame, being careful not to damage the commutator. When the armature is almost fully inserted, use the guide studs to align bearing housing (46) and framehead bolt holes (56). (Position the bearing cap to accommodate the grease tubes in UP1 and AUP1 models.)

7.When the armature has reached its limit of travel, remove the guide studs and install bearing cap

(4) with a new gasket (57) using bolts and wash- ers (52). Draw the bearing housing into framehead (56). Torque bolts to 105±115 ft.lbs.

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