6303 Pool & Spa Pump Motor Bearing 2RS Sealed - ID 17mm, OD 47mm, W 14mm

Pool & Spa Pump Motor Bearing 6303 2RS Sealed - ID 17mm, OD 47mm, W 14mm

• Physically Stocked, unlike most "drop-shipping" websites.
• Shipped from VIC, NSW, WA, QLD

Sealed 6303 deep groove ball bearing for pool and spa pump electric motors. A heavier 6300-series bearing with a 17mm shaft bore, a 47mm outside diameter and a 14mm width.

Supplied from premium manufacturers including NTN, FAG, SKF, Nachi, NSK, Koyo/JTEKT and Timken, depending on availability. All are sealed motor bearings suitable for the application.

Check Your Existing Bearing Before Ordering

While these bearings are the sizes commonly used in the pumps listed below, we recommend double checking your current bearings before ordering. Brands use several variants of motor across a model's production life, so the pump model on the nameplate does not always identify the bearing fitted inside the motor.

Specifications

• Bearing designation: 6303
• Inside diameter (bore): 17mm
• Outside diameter: 47mm
• Width: 14mm
• Type: single row deep groove ball bearing, 6300 heavy series
• Sealing: 2RS, rubber sealed both sides
• Sold as: single bearing

Where This Size Is Used

• Used in some medium and larger pool pump motor assemblies.
• Motor manufacturer and production revision determine fitment rather than the pump model name.

Not To Be Confused With The 6203

The 6203 shares the 17mm bore but is only 40mm across and 12mm wide. A 6303 is the heavier bearing for the same shaft. Confirm the outside diameter and width from the bearing itself, not from the shaft size. Note also that a 6303 is 47mm across like a 6204, but the 6204 has a larger 20mm bore.

How To Identify The Bearing You Need

• The most reliable method is to read the number stamped on the face of the old bearing. A 6303 will be marked 6303, usually followed by a suffix such as 2RS, 2RS1, 2RSH, DDU or C3.
• If the marking is unreadable, measure the bore, the outside diameter and the width with vernier calipers and match them to the figures above.
• The four-digit number sets the dimensions. Suffixes describe sealing type and internal clearance. Where the motor specifies a particular suffix or a special bearing arrangement, match that specification as well.

Symptoms Of A Failed Pump Motor Bearing

• A rumble, growl or grinding that rises and falls with motor speed
• A high-pitched squeal on start-up that settles once warm
• Noise that gets steadily worse over weeks rather than appearing overnight
• A shaft that feels notchy or rough when turned by hand with the power isolated
• Motor running noticeably hotter than usual

Find Out Why It Failed

Pump motor bearings rarely fail from age alone. The most common cause is a weeping mechanical seal letting water track back along the shaft into the front bearing. Fitting new bearings without replacing the mechanical seal usually means doing the job again. Check that the shaft slinger is present and intact while the motor is apart.

Fitting Notes

Bearing replacement needs a puller and a press or a correctly sized drift. Never drive a bearing on by hitting the outer race, which brinells the tracks and guarantees early failure. Always replace both bearings, never one. This is workshop work for someone equipped to do it, and electrical reconnection must be carried out by a licensed electrician.

Other Pump Motor Bearing Sizes

• 6201 - ID 12mm, OD 32mm, W 10mm
• 6202 - ID 15mm, OD 35mm, W 11mm
• 6203 - ID 17mm, OD 40mm, W 12mm
• 6204 - ID 20mm, OD 47mm, W 14mm
• 6205 - ID 25mm, OD 52mm, W 15mm
• 6302 - ID 15mm, OD 42mm, W 13mm
• 6304 - ID 20mm, OD 52mm, W 15mm

Frequently Asked Questions

What size is a 6303 bearing?
17mm inside diameter, 47mm outside diameter and 14mm wide.

What is the difference between a 6203 and a 6303?
Both have a 17mm bore. The 6303 is from the heavier 6300 series, at 47mm outside diameter and 14mm wide against the 6203 at 40mm and 12mm. They are not interchangeable.

My bearing measures 47mm across. Is it a 6303 or a 6204?
Check the bore. A 6303 has a 17mm bore and a 6204 has a 20mm bore. Both are 47mm outside diameter and 14mm wide, so the shaft size is what separates them.

Do I need one bearing or two?
Most pump motors use two bearings, and they are not always the same size. Check both ends of the motor, and always replace them as a pair.

Important Before Ordering: Please ensure you order correctly. Confirm this product is suitable before ordering. Seek professional assistance, or contact us with photos of your existing part, model details, serial numbers, and any labels.

As with all products, these must be diagnosed and fitted by a qualified and experienced person.