Direct Coupling Drive, Shaft Alignment

Installation

Direct Coupling Drive

Shaft Alignment

Table I

Distance from Centerline	Maximum Allowable T.I.R.
1.00 inch	0.035 inches
2.00 inches	0.070 inches
3.00 inches	0.105 inches
4.00 inches	0.140 inches

Fine Alignment

"B"

Parallel

"A"

Angular

Course Alignment

2112 1095

Rotating shaft can catch and trap clothing or body. Coupling guard must ALWAYS be in place when pump is running. Coupling

guard shown in phantom for pictorial clarity.

ALIGNMENT OF PUMP AND MOTOR SHAFT

•A flexible coupling (except for double universal joint shaft) will not compensate for misalignment. After the pump unit is fastened on the foundation, it is nec- essary to see that the shafts of the pump and motor are properly aligned.

•Each motor and pump foot should be shimmed to avoid shifting or soft foot.

COURSE ALIGNMENT

•By moving the entire unit, bring suction and discharge openings of the pump into alignment with the system piping. Install piping at this time. Pipes should align naturally with the pump (see Installation Section).

•Bring the pump and motor shaft into approximate alignment by shifting or shimming the motor. Use a straight edge to check alignment of the shafts.

•Use calipers, or a wedge thickness gauge to check the distance between coupling halves. The distance between halves should be equal at 90 degree intervals around the coupling, and the shafts should be concentric when checked with a straight edge.

Straight Edge

Centerline

Caliper

FINE ALIGNMENT

•Angular and parallel misalignment of the coupling may be corrected simultaneously. Maintain a sep- aration between coupling halves, per manufacturer’s specifications, to avoid preloading of pump and motor bearings. Clamp dial indicators to the pump and motor shaft as shown above.

•Start with angular alignment and finish check with parallel alignment.

•Rotate both the shaft and coupling together by hand. Note the total indicated runout shown on indicator “A”. The maximum allowable angular misalignment is 1 degree. Limits of reading on indicator “A” at various distances from shaft centerline are shown in Table I.

•Continue to rotate both shafts by hand and note the runout shown on indicator “B”. The maximum allow- able total indicated runout is .005 inches. Should either angular or parallel misalignment exceed the value shown, shift or shim the motor until mis- alignment is within the allowable limits shown. Do not move pump unless absolutely necessary. When shimming, be sure that all feet on the pump and motor are equally supported to avoid strains on the castings when the hold down bolts are tightened.

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