GB-414 Series™ Complete Repair | GB-41430 & GB-41440

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Learn how to tear down and perform a complete repair of Viking Pump's GB-414 Series™. In this video, we take a look at the GB-41430 and GB-41440 models. For more information, visit our website at vikingpump.com.
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To begin, make sure the pump is completely secured by clamping the bracket foot to a table.
First, using a ¾” socket, remove the head mounting foot.
Use a 15/16” socket to loosen and remove the cap screws on the head end of the pump. Discard the cap screws.
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, bushing block gasket, and o-ring.
Remove and discard both the driven gear and driver gear, as well as the drive pin.
Remove and discard the casing and alignment pins. A pry bar may be required.
Use a 15/16” socket to loosen and remove the cap screws on the bracket end of the pump. Discard these cap screws.
Next, remove the ported separation plate. Set this aside for reassembly.
Remove the two bushing blocks and gaskets, as well as the spacer. Discard the bushing blocks and gaskets but retain the spacer for reassembly.
Discard the o-ring.
Remove and discard both the driver gear and driven gear. As well as the drive pin.
Remove and discard the casing and alignment pins.
Remove and discard the bushing block and gasket.
For seal removal, first remove the outer snap ring.
Using a 3/8” Allen wrench, loosen and remove the seal holder cap screws. You can now remove the seal and shaft.
Using a 3/16” Allen wrench, loosen and remove the bearing endcap cap screws.
Retain the seal holder assembly and bearing endcap for reassembly - you may discard the other seal components and the shaft.
Prior to reassembly, ensure the pump head, ported separation plate, and bracket 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 four bushing blocks and gaskets.
Next, apply o-ring grease to the o-rings and insert into the grooves on each pump casing section.
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.
It is now time to 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 alignment pins into the bracket. Install the casing.
Next, using the snap ring pliers, install the external retaining ring to the shaft.
Install the shaft through the motor end of the bracket.
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.
When installing the bushing block, ensure that the pin lines up with the groove on the spacer.
Coat the o-ring with o-ring grease and install into the groove on the separation plate.
Next, coat the bushings with light oil and install the ported separation plate onto the shaft.
Apply anti-seize to the pump bracket cap screws.
Install and tighten the cap screws. We will torque these to their specified setting toward the end of the installation.
Next, coat the separation plate bore and the next bushing block with light oil. When installing, line up the bushing block pin with the groove on the spacer.
Install the next pair of alignment pins.
Install the casing - ensuring that the o-ring is in place.
Next, install the drive pin and coat the shaft and driver gear in light oil. Install the driver gear.
Coat the driven gear and shaft with light oil and install.