This replacement pump is one possible solution for older Cal Spas pumps using the discontinued GE motor number 5KCR39UN6050AX. There is no perfect modern drop-in replacement for this original Cal Spas pump setup because the old assembly commonly used a 56-frame motor with a 48-frame style pump wet end, which is not a common current pump configuration.
This option is the best-fit replacement currently available for many older Cal Spas equipment bays, but it is not a perfect one-for-one replacement. The wet end will need to be rotated to line up with the existing plumbing. This requires removing 2 screws on the back side of the motor to expose the 4 through-bolts that must be removed, turning the pump wet end into position, reinstalling the through-bolts, and then reinstalling the rear screws.
Depending on your spa’s equipment bay clearance, you may also need to trim or cut the handle off one of the purge plugs if it contacts the floor.
Because this is a 48-frame pump replacing an unusual older 56-frame motor & 48-frame wet-end setup, the pump may sit at a slight angle and may not sit perfectly flat once connected to the existing plumbing, making a small wedge out of wood or other material may help you resecure the pump to the tub with the lag screws.
This replacement pump is a 2-speed pump. In many legacy Cal Spas replacement situations, the original cord can be reused, but only the high-speed circuit is wired in. This pump uses a 230v- 8.5 amp motor instead of the original approximate 13 amp motor. The lower amp draw is generally safe electrically, but water flow and jet pressure may not feel exactly the same as the original pump, even though the motor RPM class is similar.
Important: This is a legacy replacement solution, not an exact OEM replacement. If your original pump label shows 5KCR39UN6050AX, we recommend sending photos of your pump, plumbing, and equipment bay before ordering so we can help verify best fit.
EZ’s Pro Tip: Replace the gaskets when replacing the pump – 2″ Flat Gasket
EZ Owner’s Note: If I personally owned an older Cal Spas hot tub with the discontinued 5KCR39UN6050AX pump, this is the replacement pump I would choose for my own spa. It is not a perfect OEM replacement, but based on fitment, installation difficulty, availability, and overall practicality, this is typically the best replacement solution currently available.
Cal Spas 5KCR39UN6050AX Replacement Pump FAQs
There is no perfect modern drop-in replacement for the old Cal Spas pump commonly associated with GE motor number 5KCR39UN6050AX. The original setup used a 56-frame GE motor adapted to a 48-frame style pump wet end, an unusual configuration not commonly supported in the modern spa pump market for the past 15+ years.
The original Cal Spas pump setup commonly used an unusual combination: a 56-frame motor with a 48-frame style pump wet end. That style of pump configuration has not been common for many years, which makes finding a true one-for-one replacement difficult.
No. 5KCR39UN6050AX is a GE motor number, not necessarily the complete pump assembly part number. The correct replacement depends on the motor, wet end, plumbing alignment, voltage, speed, amp draw, and available equipment bay space.
No. This is a legacy replacement solution, not an exact OEM replacement. The original pump/motor configuration is discontinued and does not have a perfect modern replacement. This option is intended to solve the fitment problem as closely as possible in many older Cal Spas installations.
In many installs, yes. The wet end will usually need to be rotated to line up with the existing plumbing. This may require removing 2 screws on the back side of the motor to expose the 4 through-bolts, removing the through-bolts, turning the pump wet end into position, reinstalling the through-bolts, and reinstalling the rear screws.
Not always. Because this replacement uses a 48-frame pump in place of an unusual older 56-frame motor / 48-frame wet-end setup, the pump may sit at a slight angle once connected to the existing plumbing. In some cases, a small wedge made from wood or another durable material may help support and resecure the pump with lag screws.
Possibly. Depending on your equipment bay clearance, one of the purge plug handles may contact the floor after the wet end is rotated. If that happens, the purge plug handle may need to be trimmed or cut so the pump can sit as low as possible.
In many legacy Cal Spas replacement situations, the original cord can be reused if it is still in good condition and wired correctly. This replacement pump is a 2-speed pump, but in this application the high-speed circuit is typically the only circuit wired in. Electrical work should be performed by a qualified person.
The original Cal Spas setup for this legacy pump application may not use the replacement pump the same way a standard 2-speed pump is normally wired. In many replacement situations, only the high-speed side is connected so the pump functions for the intended jet pump application.
Not necessarily. This replacement pump uses a 230V 8.5 amp motor instead of the original approximate 13 amp motor. While the motor speed is similar at approximately 3450 RPM, the lower amp draw may result in lower flow or slightly different jet pressure compared to the original pump.
This solution is designed to get your spa back up and running in hot water as easily as possible without requiring the purchase of a new spa.
In general, using a lower amp replacement motor is not usually an electrical overload concern because it draws less current than the original motor. However, compatibility still depends on proper voltage, wiring, plumbing, and spa control setup.
Possibly, but fitment is risky. Some LX 48-frame pumps may have plumbing connections that appear close, but the outer pump housing can be large enough to interfere with the tight equipment bay space found in some older Cal Spas. Even if the plumbing lines up, the larger bell housing may not physically fit.
The best way to verify fitment is to compare photos and measurements before ordering. Send photos of your old pump, motor label, wet end, plumbing connections, and available equipment bay clearance. This is one of those older Cal Spas pump replacements where physical space matters as much as the plumbing size.
Yes. Pump union gaskets should normally be replaced when replacing the pump. Old gaskets can flatten, crack, or leak after being disturbed. EZ’s Pro Tip: Replace the gaskets when replacing the pump – 2″ Flat Gasket.
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