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Rexnord

® 

Thomas

®

 Disc Couplings 

 Installation and Maintenance

Series 52 

• 

Sizes 225-750 (Tpack

(Page 1 of  4)

Rexnord Industries, LLC, 5555 S. Moorland Rd., New Berlin, WI 53151-7953

 

538-212

Telephone: 262-796-4060 Fax: 262-796-4064 

November 2008 

e-mail: [email protected] web: www.rexnord.com 

Supersedes CP-Series 52-T, 8-06 

4. 

Hub Mounting

A. General. Clean the hub bores and shafts. Remove 

any nicks or burrs. If  the bore is tapered, check 

for a good contact pattern. If  the bore is straight, 

measure the bore and shaft diameters to assure 

proper fit. The key(s) should have a snug side-to-

side fit with a small clearance over the top, and the 

corners must be chamfered.

B. 

Straight Bore —

 Install the key(s) in the shaft. If  the 

hub is an interference fit, heat the hub in oil bath 

or oven until the bore is sufficiently larger than the 

shaft. 350ºF is usually sufficient. An open flame is 

not recommended. However, if  flame heating is 

necessary, use a very large rose bud tip to give 

even heat distribution. A thermal heat stick will help 

determine hub temperature. 

DO NOT SPOT HEAT 

THE HUB OR DISTORTION MAY OCCUR.

 With the 

hub expanded, slide it quickly up the shaft to the 

desired axial position. A pre-set axial stop device 

can be helpful.

C. 

Straight Bore Slip Fit —

 Install the key(s) in the 

shaft.  Install the set screw(s) in the hub making sure 

they do not protrude into the keyway or the bore. 

Now slide the hub up the shaft to the desired axial 

position. The set screw(s) which hold the hub in 

place are tightened, using a torque wrench, to the 

values shown in Table 1A. 

 

NOTE:

  Never use two set screws one on top of  the 

other. 

D. 

Taper Bore —

 Put the hub on the shaft without the 

key(s) in place. Lightly tap the hub on the shaft with 

a soft hammer. This will assure a metal-to-metal fit 

between shaft and hub. This is the starting point 

for the axial draw. Record the position between 

shaft end and hub face with a depth micrometer. 

Mount a dial indicator to read axial hub movement. 

ATEX:

 In order for this coupling to meet 

the ATEX requirements, it is mandatory to 

precisely follow these installation instructions 

along with the included supplement form 

0005-08-49-01. This supplement outlines the 

ATEX requirements. If  the operator does not 

adhere to these instructions, conformity is immediately 

invalidated.

WARNING:

  Because of  the possible danger to person(s) 

or property from accidents which may result from improper 

use or installations of  products, it is extremely important to 

follow the proper selection, installation, maintenance and 

operational procedures.
All rotating power transmission products are potentially 

dangerous and can cause serious injury. They must be 

properly guarded in compliance with OSHA, ANSI, and 

any other local standards for the speeds and applications 

in which they are used. It is the responsibility of  the user to 

provide proper guarding.
For ATEX requirements the guard must have a minimum of  

½ inch (12.7 mm) radial clearance to the coupling major 

diameter ”A” (See Figure 1) and allow for good ventilation.

1. 

Purpose — 

These instructions are intended to help you 

to install, align, and maintain your THOMAS coupling.

2. 

Scope —

 Covered here will be general information, hub     

mounting, alignment, assembly, locknut torque, disc 

pack replacement, and part numbers.

3. 

General Information —

 The coupling, as received, 

may or may not be assembled. If  assembled, the 

locknuts are not fully tightened. Examine the parts to 

assure there is no visible damage. If  the coupling is 

assembled, remove the bolts, locknuts, and washers 

that attach the hubs to the disc packs. Remove both 

hubs. Leave the disc packs attached to the center 

member assembly.

A

HUB

C

N

N

LOCKNUT

WASHER

CENTER MEMBER

TPACK DISC PACK

BOLT

HUB

SINGLE HEADED BUSHING

CLEARANCE HOLE

BOLT HOLE

Figure  1

Содержание Thomas Tpack 52 Series

Страница 1: ...ft and hub This is the starting point for the axial draw Record the position between shaft end and hub face with a depth micrometer Mount a dial indicator to read axial hub movement ATEX In order for this coupling to meet the ATEX requirements it is mandatory to precisely follow these installation instructions along with the included supplement form 0005 08 49 01 This supplement outlines the ATEX ...

Страница 2: ...nt a dial indicator on one hub or shaft reading the other hub flange outside diameter as shown in Figure 3 Compensate for indicator set up sag Rotate both shafts together Adjust the equipment by shimming and or moving so that the indicator reading is within 001 inch per inch of the axial length between flex elements NOTE If the driver or driven equipment alignment tolerances are more stringent tha...

Страница 3: ... steel the tightened torque must be reduced to 60 of the values shown Stainless steel bolt and locknut threads must also be liberally coasted with molybdenum disulfide grease 2 Bolts should be held from rotating while the locknuts are tightened to the values shown These locknuts are cadmium plated Do not use any lubricants other than clean oil noted in Section 6 Consult Rexnord if unsure D Now pro...

Страница 4: ...ess Bolts Locknuts Washers Part No Part No Dim C Part No Part No Part No Qty Part No Qty Part No Qty 225 434408 587513 5 586056 586070 116088 16 316505 16 712610 16 587514 7 262 634409 587515 5 586058 586071 564586 16 564214 16 311399 16 587516 7 312 834410 587517 5 1 2 585913 586072 564588 16 564215 16 011674 16 587519 7 350 034411 587520 6 586059 586076 716091 16 516508 16 911767 16 587521 7 375...

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