Snapper 7800979-00 Operator's Manual page 23

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If any of the above (1 thru 5) are causing problems, service as
follows:
Cleaning Drive Disc and Driven Disc
If oil or grease on the drive disc or driven disc is causing
slippage, clean the discs as follows:
1. Wipe away any oil or grease with a clean cloth.
2. Use either an approved grease solvent or hot, soapy water
to clean drive disc or driven disc.
3. Rinse components with clean water.
4. Dry components with a clean cloth.
Drive Spring Repair / Replacement
If the drive spring (A, Figure 29) is loose, reconnect. If the spring
is broken, replace with a new spring.
Note: Use a pair of needle nose pliers to install the drive spring.
If the drive system continues slipping, see Troubleshooting .
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Driven Disc Adjustment
If the drive disc and driven disc are clean and the mower drive
is still slipping, adjust the driven disc as follows:
1. Move the ground speed control (A, Figure 30) into the FAST
position.
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2. Remove the driven disc spring (A, Figure 31) from the driven
disc assembly (B). Also remove the pin and washer (C)
from the transfer rod (D), and remove the end of the transfer
rod from the hole in the driven disc assembly.
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