Question about Porter Cable 7800 Drywall Sander With Dust Collection

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Bearing replacement on 7800

I'm having a hell of a time trying to remove the snap ring, so I can replace the bearing. Went to Lowe's and picked up a pair of Vice-Grip convertible snap ring pliers, and still am unable to remove it! Any tips,advice? Thanks Bill

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  • 1,040 Answers

The best way to sand drywall is to use a pole sander (manually). You can pick them up for about $20.

This particular machine tends to leave grooves in the drywall compound if you are not familiar with how to use it.

If you should have any questions about "Drywall Finishing/Patching", or know someone who does, put your questions to Category:"Tools- Building & Power- HAND TOOLS" at FixYa.com

Hope this helps,

Jim

Posted on Sep 09, 2010

  • Jim Parker
    Jim Parker Sep 13, 2010

    Did this, or would it have help you to solve the problem. Please rate my answer if so.

    Thanks!

    Jim

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Universal Joint: Service and Repair
Nylon Injected Ring
Universal Joint Replacement - Nylon Injected Ring
^ Tools Required
- J 9522-3 U Joint Bearing Separator
- J 9522-5 U Joint Bearing Spacer Remover
Disassembly Procedure
Notice: Never clamp propeller shaft tubing in a vise. Clamping could dent or deform the tube causing an imbalance or unsafe condition. Always
clamp on one of the yokes and support the shaft horizontally. Avoid damaging the slip yoke sealing surface. Nicks may damage the bushing or cut
the lip seal.
1. Support the propeller shaft in a line horizontal with the table of a press.
2. Mark the propeller shaft as to which end is the transmission end and which end goes to the rear axle.
3. Place the universal joint so that the lower ear of the yoke is supported on a 30 mm (1 1/8 inch) socket.
4. In order to shear the plastic retaining ring on the bearing cup, place J 9522-3 on the open horizontal bearing cups. Press the lower bearing cup out
of the yoke ear.
5. If you do not completely remove the bearing cup, lift the cross and insert J 9522-5 between the seal and the bearing cup you are removing.
Continue to press the bearing cup out of the yoke.
6. Rotate the propeller shaft. Press the opposite bearing cup out of the yoke.
7. Mark the orientation of the slip yoke to the tube for proper reassembly.
8. Remove the cross from the yoke.
9. Remove the remaining universal joint parts from the yoke. If you are replacing the front universal joint, remove the bearing cups in the slip yoke
in the same manner.
10. Inspect the retaining ring grooves for plastic.
11. Inspect the bearing cup bores in the yoke ears for burrs or imperfections.
12. Clean the remains of the sheared plastic bearing retainers from the grooves in the yoke.
13. The sheared plastic may prevent the bearing cups from pressing into place and thus prevent the bearing retainers from properly seating.
Assembly Procedure
1. Remove the bearing cups from the universal joint.
2. Assemble 1 bearing cup part way into 1 side of the yoke.
3. Turn the yoke ear toward the bottom.
4. Assemble the cross into the yoke so the trunnion seats freely into the bearing cup.
5. With the trunnion seated in the bearing cup, press the bearing cup into the yoke until the bearing cup is flush with the yoke ear.
6. Assemble the opposite bearing cup part way into the yoke ear.
7. Ensure that the trunnions start straight and true into both bearing cups.
8. Press the opposite bearing cup into the yoke ear while working the cross all the time in order to inspect for a free unbinding movement of the
trunnions in the bearing cups.
Important: If there seems to be a hang-up or binding, stop pressing, and inspect the needle bearings for misalignment in the bearing cup.
9. Press the bearing cup into the yoke until the bearing retainer groove clears the inside of the yoke.
10. Assemble the bearing retainer in the retainer groove.
11. Continue pressing until you can snap both retainers into place.
12. If seating the retainer is difficult, spring the yoke slightly with a firm blow from a dead blow hammer.
13. It may be necessary to lubricate the snap ring with a slight amount of chassis grease so the snap ring seats in the bearing cup groove.



Universal Joint: Service and Repair
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Universal Joint Replacement - External Snap Ring
^ Tools Required
- J. 9522-3 U-Joint Bearing Separator
- J 9522-5 U-Joint Bearing Spacer Remover
Disassembly Procedure
Notice: Never clamp propeller shaft tubing in a vise. Clamping could dent or deform the tube causing an imbalance or unsafe condition. Always
clamp on one of the yokes and support the shaft horizontally. Avoid damaging the slip yoke sealing surface. Nicks may damage the bushing or cut
the lip seal.
1. Support the propeller shaft in a line horizontal with the table of a press.
2. Mark the propeller shaft in order to show which end connects to the transmission and which end goes to the rear axle.
3. Disassemble the snap rings by pinching the ends together with a pair of pliers.
4. If the ring does not readily snap out of the groove in the yoke, tap the end of the cup lightly in order to relieve the pressure from the ring.
5. Place the universal joint so that the lower ear of the yoke is supported on a 30 mm (1-1/8 inch) hex head socket or a 27 mm (1-1/16 inch) socket.
6. Place J 9522-3 on the open horizontal bearing cups. Press the lower bearing cup out of the yoke ear.
7. If you do not completely remove the bearing cup, lift the cross and insert J 9522-5 between the seal and the bearing cup you are removing.
Continue pressing the bearing cup out of the yoke.
8. Rotate the propeller shaft. Press the opposite bearing cup out of the yoke.
9. Mark the orientation of the slip yoke to the tube for proper reassembly.
10. Remove the cross from the yoke.
11. Remove the remaining universal joint parts from the yoke.
12. If you are replacing the front universal joint, remove the bearing cups in the slip yoke in the same manner.
13. Inspect the retaining ring grooves for dirt, corrosion, or pieces of the old ring.
14. Inspect the bearing cup bores for burrs or imperfections.
15. Clean the retaining ring grooves. Corrosion, dirt, rust, or pieces of the old retaining ring may prevent the bearing cups from pressing into place o
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Assembly Procedure
1. Remove the bearing cups from the universal joint.
2. Assemble 1 bearing cup part way into 1 side of the yoke. Turn the yoke ear toward the bottom.
3. Assemble the cross into the yoke so that the trunnion seats freely into the bearing cup.
4. With the trunnion seated in the bearing cup, press the bearing cup into the yoke until the bearing cup is flush with the yoke ear.
5. Install the opposite bearing cup part way into the yoke ear.
6. Ensure that the trunnions start straight and true into both bearing cups.
7. Press the opposite bearing cup into the yoke ear while working the cross all the time in order to inspect for free unbinding movement of the
trunnions in the bearing cups.
Important: If there seems to be a hang up or binding, stop pressing. Inspect the needle bearings for misalignment in the bearing cup.
8. Press the bearing cup into the yoke until the bearing cup retainer groove is visible over the top of the bearing cup.
9. Assemble the bearing retainer in the retainer groove.
10. Continue pressing until both retainers can be snapped into place.
11. If the retainer is difficult to seat, the yoke can be sprung slightly with a firm blow from a dead blow hammer.
12. It may be necessary to lubricate the snap ring with a slight amount of chassis grease so that the snap ring seats in the bearing cup groove.

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1 Answer

U-joint changing


1.image
Operation: Most universal joints are held in place with a combination of pressed fit with a snap ring and either a bearing plate, bearing strap or a U-bolt. Advice: Most universal joints have two bearing caps pressed into the driveshaft and use a snap ring either on the inside or outside of the bearing cap to hold it in place. Some manufacturers use injected plastic instead of a snap ring. The injected plastic holds the cap in place under normal conditions but will break free when pressure is applied during the removal process. The replacement universal joint will use a snap ring instead of the injected plastic. The other two bearing caps are usually held in place by either a bearing plate, bearing strap or a U-bolt all of which can be removed with a normal ratchet and socket or wrench. Occasionally you will find all four bearing caps using the press fit method. In these cases two of the bearing caps will be pressed into a flange that unbolts from the differential or a slip yoke that slides off of the transmission tail shaft.

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1 Answer

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Bearing is pressed into the knuckle,hub is pressed into bearing.You will need to take knuckle off,remove large snap ring & press out hub,then bearing.Hope this helps

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