Emerson VSSG, VSG manual 5. Disc Pack Installation Torque Specifications, Maintenance/Service

Section 5 • Maintenance/Service

Angular Alignment Parallel Offset

Figure 5-9. Angular Alignment and Parallel Offset

the disc pack.

24.Install bolts and locking nuts to secure both disc packs to center member.

25.Tighten locking nuts.

26.If room is required to install center member, adjust hub position accordingly. If both the motor and compressor hubs are straight bores, adjust either hubs. If one hub is tapered and the other a straight, adjust the straight bore hub.

27.Using additional supports supporting center mem- ber. Install bolts and locking nuts to secure center member to compressor hub.

28.Tighten locking nuts.

29.Position hubs, ensure distance between face of both hubs is 5”.

NOTE

If there is waviness with the disc pack installed, adjust

distance accordingly until disc pack is straight.

30.Install bolts and locking nuts to secure disc pack to motor hub.

31.Tighten locking nuts, see Table 5-4.

Table 5-5. Disc Pack Installation Torque

Specifications

Coupling	Lock Nut	Tightening
		Torque
Size	Size
		ft-lbs (Nm)
BP38U	5/16-24	22	(30)
BP41U	7/16-20	55	(75)
BP47U	9/16-18	120	(163)
BP54U	9/16-18	120	(163)
BP56U	9/16-18	120	(163)

Table 5-4. Hub Clamp Bolt and Set Screw Torque Specifications

Coupling		Clamping Bolt				Set Screw
			Torque			Torque
Series/Size	# Bolts	Size-Pitch			Size
			ft-lbs (Nm)			ft-lbs (Nm)
BH38U	4	1/4-28	12	(16)	3/8	10 (13)
BH41U	4	5/16-24	23	(31)	3/8	10 (13)
BH47U	4	3/8-24	49	(66)	1/2	20 (27)
BH54U	4	7/16-20	78 (106)		1/2	20 (27)
BH56U	4	1/2-20	120	(163)	5/8	40 (54)
DP42	4	1/2-20	120	(163)	1/2	20 (27)

5 – 12 VSG/VSSG • Installation, Operation and Maintenance Manual •Vilter/Emerson • 35391SSG