Assembly of pump, Changing pump rotation – Viking Pump TSM680: 895, 893 and 897 Mag Drive User Manual

Page 11

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SECTION TSM

680

ISSUE

G

PAGE 11 OF 17

ASSEMbLY OF PUMP

Use a suitable lubricant compatible with the fluid being

handled when reassembling the pump.

Inspect all parts, especially drilled holes in the casing for

the suck back system, to make sure they are not plugged.

Replace any worn parts, remove any burrs, and clean all

parts before assembling the pump.,

1. If the canister o-ring needs to be replaced, apply a

lubricant to the o-ring and place it into the o-ring groove.

If the o-ring is PTFE (Derivative) Encapsulated, follow

these special instructions.

Do not attempt to reuse a PTFE (Derivative) Encapulated

o-ring if it has been removed. Immerse a new o-ring in

boiling water for a few minutes. Remove it from the water

and stretch out the o-ring so it will fit onto the casing hub

without forcing it over a sharp edge. Run hot water over

the o-ring until it shrinks down tight onto the pilot of the

pump. Dry with compressed air.

2. Place the balance plate into the casing bore with

counterbores for the capscrews facing out and push it to

the bottom of the bore. Align holes to install capscrews.

Install the capscrews and tighten evenly to 10 in-lbs.

3. Clean the rotor and shaft so it is free of dirt, grit and

other debris and apply lubricant. Push it into the casing

as far as it will go.

4. If the old gaskets are not reusable, refer to “ADJUSTING

HEAD GASkET END CLEARANCE” on page 14.

Otherwise, place the head gaskets on the head. The

proper amount of gaskets should be used to provide the

correct end clearance.

Figure 26 gives the quantity of

gaskets available in a gasket set along with standard

end clearance. Refer to Techincal ReferenceTR-807 for

detailed instructions on setting end clearance.

PUMP MODEL

NORMAL (A) END

CLEARANCE

SET OF

GASkETS

INCLUDES

GG 895, 893

0.003

GG 897

0.005

HJ,HL 895, 893

0.005

(1) .015

(2) .007

(2) .005

HJ, HL 893, 897

0.005

AS, AK or AL 895, 893

0.005

AS, AK or AL 897

0.008

NOTE: End Clearances are adequate for viscosity’s up to

2500 SSU (SAE 40-lube oil at room temperature). Higher

viscosity’s require additional clearances. As a general rule

the end clearance is doubled for higher viscosity’s. For

specific recommendations for end clearance for viscosity or

for operating temperatures above 225 °F, check with your

Viking representative or consult the factory.

5. Coat the idler pin with a suitable lubricant and place the

idler on the idler pin in head.

6. The head can now be assembled onto the pump. Tilt the

top of the pump head away from the pump slightly until

the crescent enters the inside diameter of the rotor and

rotate the idler until its teeth mesh with the rotor teeth.

The Pump head and casing should have been marked

before disassembly to insure proper reassembly. If not,

be sure the idler pin, which is offset in the pump head,

is positioned toward and an equal distance from the port

connections to allow for proper flow of liquid through the

pump.

7. Place the key into shaft keyway and then follow the

instructions listed for assembling the appropriate size

coupling on

pages 12 through 14.

CHANGING PUMP ROTATION

Cooling circulation in the pump is designed to take fluid from

the discharge side of the pump and channel it down the idler

pin into the shaft and out the far end of the shaft into the

bottom of the canister. The fluid is returned through a hole in

the casing back to the suction side of the pump. There are

generally three parts, which may need replacing or adjusting.

Technical Reference TR-112 provides additional information

about changing rotation. Contact your authorized distributor

or the factory to request a copy.

HEAD & PIN- The hole should be from the discharge side of

head to the pin. Some sizes are tapped on both sides and

the pipe plug may be moved to the other side of the head but

other models will require a new part.
bALANCE PLATE- Most designs currently are directional

and require a new part.

CASING- Some are drilled and tapped for either direction

but most feature a single hole and require a second hole for

proper return of the cooling fluid. The initial casing hole is

generally plugged or restricted with an orifice or by the new

balance plate.
Contact your local Viking distributor or the factory to

determine which parts are required.

FIGURE 26

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