Troy-Bilt 31/2 HP - Manual (Page 41)

MAINTENANCE
To replace a damaged blade: 3. Use a heavy hammer (preferably a ball peen ham­
mer) to pound the protruding shanks of the rivets into
heads.
NOTES
Three different iengths of rivets are used to
attach the various blade sections or ledger
plates to the bars:
a. The 18 millimeter rivets are used to attach
the iedger plates to the ledger bar on the
38-inch bar only.
b. The 16 millimeter rivets are used to attach
both an individuai blade section and a
wear plate to the cutter bar. The 16 milli­
meter rivets are also used to attach a
ledger plate to the ledger bar on the 34-
inch bar.
c. The 14 miilimeter rivets are used on both
the 34-inch bar and the 38-inch bar to
attach only a blade section to the cutter
bar.
Use the three-hole blade to replace either of
the (broken) three-hole blades that are located
underneath the cutter bar drive pin. Use a
two-hole blade to replace any of the other
(broken) blades.
• Ledger plates are not interchangeable with
the cutter bar blade sections.
1. Piace the blade section on the bar. Then insert the
correct length rivet (see Notes above) through the
holes in the biade section and bar.
0 0<b è O O O O
1 fi
Figure 5-47: Placing a new biade section and rivets on the
bar.
2. Place the portion of the bar with the new blade
and rivets onto the steel object you used when driv­
ing the rivets out of the blade.
A CAUTION
When pounding the rivet shanks into heads, wear
safety glasses or goggles to prevent any stray
chips from hitting your eyes.
Failure to do so could result in personal injury or
property damage.
HEAD FORMED
ORIGINAL PROTRUDING HAMMER
FACTORY SHANK OF
HEAD RIVET
Photo 5-48: Forming the rivet shanks into heads.
4. Check the other end (the countersunk end) of the
newiy instalied rivets. Make sure that these ends are
flush with the blade section. If they are not flush, file
the countersunk ends until they are flush with the
blade section.
5. Slide the cutter bar back into the cutter blade
assembly. Move the cutter bar back and forth to make
sure that the newly installed rivets don’t hang up
anywhere. If the newly installed rivets do hang up,
use a file to slowly remove any excess metal from the
rivet heads until the cutter bar can be moved back
and forth without any interference.
6. Reinstall the drive pin on top of the cutter bar. Use
a 13 MM (or a %-inch) wrench to evenly and securely
tighten the two bolts that hold it in piace.
7. Place the drive socket on the drive pin and reinstall
the cutter bar assembly on the mower. Refer to Page 34
in this Manual for instructions.
39