I need new bearings for seat of body sculpture rowing machine br 3050

It is probably the pulley that has come loose!
Check the pulley locking nut is allowing the pulley to move out!

return spring broken replace..

very common problem

1( LUBE the deck belt, this happen because the lack of maintenance

2( LUBE the rollers bearing too.

3( test the input voltage motor, if there are the motor need repair.see my personal TIPS
4( test the output voltage board, for input voltage motor, if there are NOT the board is faulty.
God bless you

Good News! Home Depot sells (on-line only) drawer rollers that work PERFECTLY for the Tunturi Rower machine seat rollers. The only difference is the wheels are nylon instead of rubber. Model Number R7228, Internet Number: 100142874. Item description: ROLLER, W/ 1/4" -20 STUD, 1-1/8" NYLON, BALL BEARING. There are two rollers in a package, $5 for two! http://www.homedepot.com/buy/prime-line-1-1-8-in-nylon-ball-bearing-drawer-rollers-2-pack--r-7228.html

Looking fo manaul

yes, get that one here

Good News! Home Depot sells (on-line only) drawer rollers that work PERFECTLY for the Tunturi Rower machine seat rollers. The only difference is the wheels are nylon instead of rubber. Model Number R7228, Internet Number: 100142874. Item description: ROLLER, W/ 1/4" -20 STUD, 1-1/8" NYLON, BALL BEARING. There are two rollers in a package, $5 for two! http://www.homedepot.com/buy/prime-line-1-1-8-in-nylon-ball-bearing-drawer-rollers-2-pack--r-7228.html

Good News! Home Depot sells (on-line only) drawer rollers that work PERFECTLY for the Tunturi Rower machine seat rollers. The only difference is the wheels are nylon instead of rubber. Model Number R7228, Internet Number: 100142874. Item description: ROLLER, W/ 1/4" -20 STUD, 1-1/8" NYLON, BALL BEARING. There are two rollers in a package, $5 for two! http://www.homedepot.com/buy/prime-line-1-1-8-in-nylon-ball-bearing-drawer-rollers-2-pack--r-7228.html