Backlapping - Jacobsen Super LF 1880 Parts & Maintenance Manual

4.19 BACKLAPPING____________________________________________________________

!
WARNING
To prevent injury, keep hands, feet, and clothing away
from rotating reels.
When the backlap switch is in the REVERSE position,
the reels will turn whether the operator is on or off the
seat.
Carbon Monoxide in exhaust fumes can be fatal when
inhaled, never operate an engine without proper
ventilation.
Check the reel and bedknife to determine if backlapping
or grinding will restore the cutting edge.
If wear or damage is beyond the point where the cutting
edges can be corrected by the lapping process, they
must be reground.
To Backlap:
1. Adjust reel to bedknife as described in Sections 3.11
and 3.12.
2. Lower the reels to the ground.
3. Open the hood and turn the backlap switch to
Reverse rotation. Close hood.
a. Make absolutely certain your feet and clothing
are far away from the reel.
b. Make sure the parking brake is Engaged, reel
switch is OFF, and the traction pedal is in neutral.
c. Start the engine. Adjust throttle just above minimum
RPM and place the reel switch in ON position.
MAINTENANCE
4. Adjust the reel valves located under the operator
platform, to the desired speed.
5. Apply lapping compound with a long handle brush
to high spots first then along entire length of the
reel.
6. Continue lapping and at the same time make a
slight adjustment on the reel until there is a uniform
clearance along the full length of the cutting edges.
7. When the blades have been evenly honed, carefully
and thoroughly clean off the remaining lapping
compound.
8. Disengage reel switch and stop the engine. Open
the hood and return backlap switch to Forward
rotation.
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