Convert Pump from Stuffing Box Mechanical Seal to Behind the Rotor Seal - 4127C & 4227C Series™
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***Download the Technical Service Manual here: https://vp.salesmrc.com/item/12498
0:00 Introduction
0:27 Disassembly
3:16 Bushing removal & installation, lip seal installation
4:11 Reassembly
In this video we will guide you through the conversion from a behind the rotor seal to a component mechanical stuffing box seal in Viking Pump’s stainless-steel pumps – with U-Plus™ bracket and ProPort™ casing. To more or to see other repair videos, please visit our website at VikingPump.com.
This video applies to these pump models:
H4127C HL4127C K4127C KK4127C L4127C LL4127C
H4227C HL4227C K4227C KK4227C L4227C LL4227C
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To begin, remove the stainless steel window guards from the bracket.
Next, bend up the tang of the lock washer.
Place a brass or hardwood bar into the port opening to keep the pump from turning.
Loosen and remove the locknut. Remove and discard the lock washer.
Loosen the bearing housing set screws.
Loosen and remove the bearing housing.
Remove the bearing spacer collar. The collar may have come out the bearing housing.
Remove the half round rings.
Loosen and remove the seal holder locknuts. Remove the seal holder, seal seat, and seal gasket. Remove the T-bolts.
Remove the seal access hole plug to reveal the seal set screws.
Loosen each of the seal rotary member set screws.
Carefully shift the rotary member down the pump shaft so it can be removed.
Remove any suckback or flush lines and install plugs.
Loosen and remove the head capscrews.
Remove the head by tilting it backward to prevent the idler from falling off the idler pin.
Remove and discard the head gasket.
Remove the rotor shaft. A soft headed hammer may be used to tap on the end of the shaft to aid with removal.
Loosen and remove the casing capscrews and remove the casing.
Remove and discard the bracket gasket.
Remove the plug on the opposite side of the other open seal access hole.
At this point, the bushing will need to be removed and new bushing installed in the behind the rotor seal position.
Using a hydraulic press, carefully press out the old bushing.
When installing use care to avoid breaking or damaging the carbon graphite bushing. Bushings with lubrication grooves should be installed with the groove at the twelve o’clock position and the notches facing the head end of the pump at the 3 and 9 o’clock positions. Lubricate the bushing and ensure it is started straight. Bushings in the behind the rotor seal configuration need to be pressed to the appropriate depth. Please refer to the technical service manual to confirm proper bushing depth for your pump size.
Lubricate and place the bracket lip seal with the spring side down – toward the casing end of the pump. Using a flat press fixture, fully press in the lip seal.
Before reassembly, ensure the casing, bracket, head, idler, idler pin, and rotor shaft are free of any debris or wear. Replace any worn components.
Using thread sealant install a grease zerk on one side of the bracket. Use an adapter fitting if needed. On the opposite side, install a grease relief fitting. Use an adapter fitting if needed.
Install the bracket gasket. Apply appropriate gasket sealant to the bracket and ensure even coverage on both sides of the gasket.
Install the casing.
Install the seal installation sleeve onto the shaft.
Lubricate the shaft and install the seal rotary member until it makes contact with the back of the rotor. Tighten each set screw until they just make contact with the shaft – then fully tighten the set screws.
Remove the seal clips to engage the seal.
Turn the pump up onto the bracket to aid with seal seat installation.
First install the seal spacer.
Next install the seal seat with the pins down and aligned with the grooves in the bushing. Carefully push the seal until it is fully seated against the seal spacer.
Before installing the rotor shaft, tape the threads at the end of the shaft to prevent damage to the lip seal in the bracket. Lubricate and install the rotor shaft. Take care not to damage the seal seat or lip seal during installation. Remove the tape and seal installation sleeve.
Install the half-round rings. Install the bearing spacer collar over the half round rings.
Since the seal is engaged and pushing the rotor shaft out of the pump. The bearing housing will need to be installed to aid with head installation. Install the lockwasher by aligning the tab through the slot on the shaft. Install the locknut.
