Mag Drive Repair | 8124A Series™, 8123A Series™, & 8127A Series™

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8124A Series™: vp.salesmrc.co...
8123A Series™: vp.salesmrc.co...
8127A Series™: vp.salesmrc.co...
In this video we will guide you through the disassembly and reassembly of Viking Pump’s 8124A, 8123A, and 8127A Series™ mag drive internal gear pumps. To learn more or to see other service videos, please visit our website at vikingpump.com
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To begin, separate the pump from the bracket.
Remove the 4 socket head capscrews that secure the pump to the bracket. A hoist or blocking of the pump can help support the pump through this process.
Use the provided jackscrews in the bracket to separate the inner magnet from the outer magnet. Two, six to eight inch lengths of all thread rod placed into the diagonal capscrew locations in the bracket help to keep the assemblies properly aligned throughout this process. It’s important not to place your fingers in the gap between the bracket and pump assembly as this is a potential pinch point.
Once separated, it’s important to keep a large space between the outer magnet and inner magnet and to keep metal tools and electronics away from each.
To disassemble the pump end, remove the socket head capscrews which hold the canister to the adaptor plate. Grip the canister firmly and rotate back and forth to break it free of the adaptor plate. Pull the canister off, but be aware that it will likely contain liquid which will drain out. Clean and inspect the canister and bushing.
Using an allen wrench, loosen the locknut setscrew and remove the locknut.
Remove the inner magnet, making sure to keep it away from the pump and metal tools. Place it with the thrust washer pin facing up so as not to bend or otherwise damage the pin. Remove the shaft key. Remove the inner thrust washer.
To inspect the head and idler pin assembly, remove the head bolts and remove the head, shims, and o-ring from the pump. Tilt the head back to prevent the idler gear from falling off the idler pin. Remove the idler gear and bushing assembly from the idler pin and inspect the idler gear, bushing, pin, and head. The bushing can be removed using a press if replacement is needed. Detailed instructions on this process are included in the service manual.
Discard the old o-ring. Inspect the shims. If shims have become bent or otherwise damaged, they will need to be replaced to ensure the pump clearances are correct when reassembled.
Remove the rotor from the pump casing and the inner thrust washer. Inspect the thrust washers and adaptor plate bushing. Inspect the casing and rotor. If replacing the adaptor plate o-ring, remove the bolts that hold the casing to the adaptor plate to access.
You may now reassemble the pump end. If the casing was removed from the adaptor plate, make sure that it is installed with a new o-ring. Confirm that the casing groove aligns with the adaptor plate groove and bolt the 2 together using the provided capscrews.
Place one thrust washer onto the rotor shaft, making sure to align the pin with the hole on the thrust washer. Using a compatible lubricant, lubricate the bushing and shaft and insert the rotor shaft into the adaptor plate bushing.
Reinstall the shims onto on the pump head. If the shims have become damaged, replace them and confirm the end clearance as detailed in the service manual and per your pump’s serial number. Lubricate and install the o-ring. Place the idler gear on the idler pin (may want to add on-screen note that extra end clearances are used for pumps at elevated temperatures and viscosities.)
Bolt the head to the casing.
Slide the second thrust washer onto the shaft with the drive hole facing out. Install the key on the shaft. Slide the inner magnet onto to the shaft, with the pin side toward the pump. Align the keyway with the shaft key and the thrust washer hole with the pin on the magnet. Install the split locknut, but do not tighten at this time.
To ensure proper clearances for the thrust washers, insert 2 feeler gauges, one on each side of the shaft, between the thrust washer and the adaptor plate bushing. These should be two thousandths of an inch for these pump sizes but one thousandth of an inch for H and HL sizes. Tighten the locknut until the feeler gauges are snug, but can still be removed. Tighten the locknut setscrew. Slide out the feeler gauges. If they cannot be removed or easily fall out, repeat this process.
Using a compatible lubricant, lubricate the canister bushing.