Viking K-823, KK825, KK827, K-825, KK823, K-827 service manual Assembly Pump, Gasket Table

ASSEMBLY: PUMP

Use a suitable lubricant compatible with the fluid being handled when reassembling the pump.

Inspect all parts, especially drilled holes in casing for the suck back system to make sure they are not plugged. Replace any worn parts and polish any burrs; clean all parts; assemble pump.

1.If the canister O-rings need to be replaced, apply a lubricant to the O-ring and place into the O-ring groove. If the O-ring is PTFE (derivative) encapsulated, follow these special instructions.

Do not attempt to reuse the primary O-ring if it has been removed (and is PTFE derivative encapsulated). Immerse a new O-ring in boiling water and stretch out O-ring so it will fit onto casing hub without forcing over a sharp edge. Run hot water over O-ring until it shrinks down tight onto the pilot of the pump. Dry with compressed air. The secondary PTFE derivative encapsulated O-ring can be placed in the bracket groove with some lubricant.

2.If casing was removed from bracket, inspect flat gasket and replace if necessary. Install casing onto bracket pilot in the same orientation as before. This series of pumps does not allow rotating the casing to alternate port configurations – to modify the port arrangement, Refer to “Pump Rotation” on page 10. Secure the casing with (8) capscrews.

3.Place the balance plate (if separate from bracket) into the casing bore (this step may not be required in the 825 series). Make sure plate is positioned the same as before. Refer to Figure 15 for standard balance plate positioning.

DISCHARGE

PORT

SUCTION	GROOVE
PORT

STANDARD POSITION

CW ROTATION AS

VIEWED FROM HEAD

figure 15

5.If old gaskets are not reusable, refer to “Adjusting Head Gasket End Clearance” on page 10. Otherwise, place the head gaskets on the head. The proper amount of gaskets should be used to provide the correct end clearance. Table 2 gives the quantity of gaskets available in a gasket set along with standard end clearance.

GASKET TABLE

	NORMAL END	SET OF GASKETS
PUMP MODEL	CLEARANCE	CONSISTS OF THE
	(iNCH.)	FOLLOWING
K & KK 825	.008	(1)	.015
		(2)	.007
K & KK 823, 827	.010	(3)	.005

End clearances are adequate for viscosity’s up to 750 SSU (SAE 20-lube oil at room temperature). Higher viscosity liquids require additional end clearances.

TABLE 2

As a general guideline, for viscosity’s between 750 and 7500 SSU (heavier lube oils) double the amount of end clearance indicated, for viscosity’s between 7500 and 25,000 SSU (e.g., resins) triple the amount indicated.

For specific recommendations for end clearances for viscosity or for operating temperatures above 225ºF, check with your Viking Representative or consult the factory.

6.Coat the idler pin with a suitable lubricant and place the idler on the idler pin in the head.

7.The head can now be assembled on 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. Pump head and casing should have been marked before disassembly to insure proper reassembly. If not, be sure idler pin, which is offset in the pump head, is positioned toward and an equal distance from port connections to allow for proper flow of liquid through the pump.

8.Install relief valve if provided and removed. Valve cap should point to Suction side of the pump (See Figure 3 on page 2).

9.Place key and external retaining ring onto shaft then follow instruction listed for assembling to the coupling.

4.Clean rotor and shaft so it is free of dirt, grit and other debris and apply lubricant. Push into casing and bracket bushings as far as it will go.

SECTION TSM 845 ISSUE F PAGE 9 OF 14