I believe that machine uses the Kawasaki FJ180V engine in which case it is 10W30 oil labelled SH or higher
A detailed description is available in related links.
Likely replace the self propelled tranny. not cheap repair job
You tip the machine over side ways, after removing the oil dip stick, with the carburator up.
If your Cub Cadet SRC 621 is not producing a spark, first check the spark plug for wear or damage and replace it if necessary. Ensure that the ignition coil is functioning properly and that all connections are secure. Additionally, inspect the kill switch and wiring for any faults. If these components are in good condition, the issue may require further diagnosis of the ignition system.
2 percent of 621 = 12.422% of 621= 2% * 621= 0.02 * 621= 12.42
if 60% of number = 621 then: number = 621 ÷ 60% = 621/(60/100) = 621×100/60 = 1035
621/2= 310.5
Ah, the Jonsered 621 chainsaw is a beautiful tool for creating art in the great outdoors. It has a 61cc engine, a 20-inch bar, and weighs around 13 pounds. Just imagine the lovely landscapes you can create with this reliable and powerful friend by your side.
The factors of 621 are: 1 3 9 23 27 69 207 621
621 is not prime. 621 = 3 * 3 * 3 * 23
474/621 = 474/621 x 100 % ~= 76.3%