Adjusting END Clearance, Procedure a, Procedure B

ADJUSTING END CLEARANCE

Table 7-A provides standard operating end clearance for this pump. Use either of the following procedures to properly adjust the end clearance when replacing shims or reassembling the pump.

PROCEDURE A

After the rotor has been installed and the locknut has been positioned and retained, insert a feeler gage of the proper end clearance thickness into the port at the root (base) of two rotor teeth (See Figure 20). For convenience, remove the head O-ring and install one 0.007” shim onto the head. With the idler on the idler pin, place the head into the pump casing. With the capscrews tight, the feeler gage should fit snugly between the idler and the rotor face; otherwise shims should be added or reduced in thickness until the proper clearance is attained.

PROCEDURE B

If the pump is in line and ports are not accessible, remove the head and shims. Put the head back on (without shims) and measure the gap as shown (See Figure 21). After determining the gap between the head and casing, select a combination of shims equal to the measured gap plus the desired end clearance (See Figure 21). Remove head, install shims then install head. Tighten the head capscrews and check the pump clearance by making sure the pump turns freely by hand. Since the pump shaft is concealed, it is best to work up to the proper end clearance because it is difficult to determine when there is too much end clearance with this approach.

Head	Coupling
end	end

FIGURE 20

FIGURE 21

	NORMAL1	SET OF HEAD
	END	SET OF HEAD
	END	SHIMS INCLUDES
	CLEARANCE	SHIMS INCLUDES
	CLEARANCE
	(inch)
AS, AK, AL 855	0.005	(1) .007
AS, AK, AL 855	0.005	(1) .005
		(1) .005
KE, KKE 855	0.005	(2) .002
KE, KKE 855	0.005	(2) .001
		(2) .001

1End Clearances are adequate for viscosities up to 2500 SSU /

540cSt (SAE 40 lube oil at room temperature). Higher viscosities require additional clearances. As a general rule the end clearance is doubled for higher viscosities. For specific recommendations for end clearance for viscosity or for operating temperatures above

225°F (107 °C), check with your Viking representative or consult the factory.

tABLE 7-a

PRESSURE RELIEF VALVE INSTRUCTIONS

DANGER !

	Before opening any Viking pump liquid cham-	engine, etc.) has been “locked out” or made
	Before opening any Viking pump liquid cham-	non- operational so that it cannot be started
	ber (pumping chamber, reservoir, relief valve	while work is being done on pump.
	adjusting cap fitting etc.) Be sure:	3.That you know what liquid the pump has been
	1.That any pressure in chamber has been	3.That you know what liquid the pump has been
	1.That any pressure in chamber has been	handling and the precautions necessary to
	completely vented through suction or	safely handle the liquid. Obtain a material
	discharge lines or other appropriate openings	safety data sheet (msds) for the liquid to be
	or connections.	sure these precautions are understood.
	2.That the driving means (motor, turbine,	Failure to follow above listed precaution-
		ary measures may result in serious injury or
		death.

SECTION TSM 685.2 ISSUE C	PAGE 13 OF 16

855 specifications

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