Disassembly assembly thrust bearing adjustment – Viking Pump TSM420: HL-LL 4925 User Manual

Page 14

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PUMP

SIZE

Turn Outer End Cap C.C.W.

No. of Notches* or Length on O.D., Inches

HL

2

¹

⁄₂”

K - HL

4

1”

SECTION TSM 420

ISSUE

E

PAGE 14 OF 18

The Viking Over-Pressure Relief Valve is strictly an over-

pressure relief valve; it is not a pressure regulating valve

In ordering parts for relief valve on head, always be sure

to give Model and Serial Number of the pump as it appears

on the nameplate (secured to the pump) and the name of

the part wanted When ordering springs, be sure to give the

pressure setting desired

VIKINg OLD SERIES 924 HEAVY-DUTY

REfRIgERATION AMMONIA PUMPS

THRUST BEARINg DISASSEMBLY,

ASSEMBLY AND ADJUSTMENT

1. Loosen radial set screws in the outer ring of the bearing

housing and remove the bearing housing end cap, lip

seal and bearing spacer collar Use a spanner wrench to

remove the end cap

2. Remove the double row ball bearing The bearing should

be washed thoroughly and examined If there is any

evidence of wear or damage, a new bearing should be

used

3. Examine the lip seal in the bearing housing and end

cap These lip seals are important to the assembly and

should be replaced if not in first class condition They are

a grease seal for the ball bearing and also act as a shield

to keep dirt and other abrasive particles from entering

the bearing When installing new lip seals, be sure they

are assembled with the lips facing toward the shaft end

See figure 22.
Return to page 8, step 8, for further disassembly

1. Place the inner bearing spacer collar on the shaft as far

as it will go

NOTE: First replace the snap ring or keeper rings if

furnished in your pump

See figure 22.

2. Install the bearing housing with inner lip seal into the

bracket

NOTE: If bearing housing has not been disassembled

or has been pre-assembled skip items 3 and 4

3. Pack the ball bearing with grease, place on the shaft and

push or gently drive into place in the housing

4. Turn the bearing housing end cap (with lip seal and

bearing collar inside) into the bearing housing until it is

tight against the bearing Lock in place by tightening the

radial set screws in the outside diameter of the bearing

housing

5. Turn the bearing housing assembly clockwise until pump

shaft can no longer be turned by hand The rotor is now

forced against the head

6. Install the lockwasher and locknut on the shaft, tighten

lock nut and bend down tang of the lockwasher into slot

of locknut
NOTE: A piece of brass or wood inserted through the

port opening between the rotor teeth will keep the shaft

from turning

1. Loosen two axial set screws in the outer face of the

bearing housing and turn the thrust bearing assembly

clockwise until it can no longer be turned by hand Back

off counter clockwise until the rotor and shaft can be

turned by hand with a slight noticeable drag

2. For standard end clearance, back off the thrust bearing

assembly the required number of notches or an equivalent

length measured on the outside of the bearing housing

See the following table

3. Tighten the two axial set screws in the out board face of

the bearing housing, with equal force against the bracket

Your pump is now set with standard end clearance and

locked
NOTE: Be sure the shaft can rotate freely If not, back off

additional notches and check again

4. Each additional notch (or each ¼” on the outside diameter

of the bearing housing) is equivalent to an extra end

clearance of 002” on HL size pumps; and 0015” on K,

KK, LQ and LL size pumps

5. Insert the pipe plug (drain) into the bracket Close the

hand valve and fill with oil reservoir with 1½” of the top

with lighter Refrigeration Oil It is recommended that the

oil be drained and the reservoir be refilled after the first

100 hours of operation and then after every 1000 hours

NOTE: Re-open the hand valve before the pump is into

operation The double mechanical seal will not function

properly, if it is exposed to ammonia pressure with the

valve closed

6. Return to installation of Carbon Graphite Bushings, page

13, and continue on

DISASSEMBLY

ASSEMBLY

THRUST BEARINg ADJUSTMENT

fIgURE 22

SETSCREW

SHAfT

LIP SEALS

BEARINg HOUSINg

SPACER

COLLAR

(INNER)

BALL BEARINg

SNAP RINg OR

KEEPER RINg

END CAP

SPACER

COLLAR

(OUTER)

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