Rebuilding a GB-425 Series™ Pipeline Injection Pump

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In this video, learn how to perform a complete rebuild of a GB-425 Series™ pipeline injection pump. To learn more, visit our website at vikingpump.com
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To begin, make sure the pump is completely secured by bolting to the table or work bench.
Loosen and remove the capscrews on the head end of the pump. Discard the capscrews.
Remove the head mounting foot.
Next remove the head. A pry bar may be required. Be careful not to damage the face of this component. Set the pump head aside for reassembly. You may then remove and discard the bushing block and gasket, and the head o-ring.
Remove and discard both the driven gear, driven shaft and driver gear, as well as the drive pin.
Remove and discard the alignment pins, the casing, and casing o-ring.
Next, remove the separation plate. Discard the two bushing blocks and gaskets, and the o-ring. Retain the separation plate and the spacer for reassembly.
Remove and discard the next driven gear, driven shaft, driver gear, and drive pin.
Remove and discard the next alignment pins, casing, and o-ring.
Loosen and remove the capscrews on the bracket end of the pump. Discard these capscrews.
Next, bend up the tang on the lock washer. Insert a brass bar or piece of hardwood through the port and between the gears to prevent the shaft from turning. Loosen and remove the locknut and washer.
Remove the brass bar.
Next, remove the ported separation plate.
Discard the two bushing blocks and gaskets and the o-ring. Retain the ported separation plate and the spacer for reassembly.
Remove and discard the nexdt driven gear, driven shaft, driver gear, and drive pin.
Remove and discard the next alignment pins, casing, and o-ring.
Remove and discard the final bushing block and gasket.
For seal removal, first loosen and discard the bearing endcap capscrews. Retain the bearing end cap for reassembly. Remove and discard the bearing spacer.
Loosen and remove the seal holder capscrews. If necessary, use two of the capscrews as jackbolts to slowly press out the seal holder. Use the tapped holes at the 9 and 3 o’clock positions. Remove and discard the seal holder o-ring and stationary seal seat. Retain the seal holder for reassembly.
You can now remove the rotary seal components.
Break the grip of the bellows seal using a pair of picks. Remove and discard the seal components. Remove and discard the snap ring.
You may now discard the drive shaft.
Prior to reassembly, ensure the pump head, separation plate, ported separation plate, bracket, and spacers are clean and free of debris.
It is recommended to complete all subassemblies before starting to rebuild the pump, to ensure all components are in place.
Begin by applying o-ring grease to the bushing block gaskets and inserting them into the grooves of the bushing blocks with the protrusions down, to aid with adhesion. Do this for all bushing blocks and gaskets.
Next apply o-ring grease to the o-rings and insert into the grooves on each pump casing section, on each separation plate and the pump head.
Install each driven gear and drive pin onto their corresponding driven shaft and insert an external retaining ring on each side in the grooves.
Each gear set needs to remain with their corresponding serialized casing. The serial numbers can be found on each gear and the casing.
Finally, apply anti-seize to the head and bracket capscrews as well as the seal holder and bearing endcap capscrews.
You can now begin rebuilding the pump.
Apply light oil to the bushing block and bracket bores. When installing, make sure to line up the bushing block pin with the groove in the bracket. It may be necessary to use a soft-headed hammer to gently tap the bushing block into place. Be careful not to damage the faces of the bushing block.
Install the shaft into the bracket.
Install the alignment pins and casing.
Install the drive pin and coat the driver shaft with light oil. Install the driver gear.
Apply light oil to the driven gear and driven shaft assembly and install.
Next, coat the spacer, ported separation plate bushing block, and bores with light oil.
When installing the spacer, ensure that the groove lines up with the pin at the bottom of the ported separation plate bore.