Jacobsen G-Plex III Parts And Maintenance Manual

GB-25
JACOBSEN G-PLEX III Series: DN & DP
MAINTENANCE AND PARTS MANUAL
GB
6.5 BACKLAPPING
Backlapping on a regular basis will help keep the
cutting edges sharp and extend the life of the reel.
Backlapping may be performed on one cutting head
only, two heads, or all three heads simultaneously. If
backlapping one or two cutting heads is desired,
back off slightly on the bedknifetoreel clearance on
the head(s) not requiring backlapping. This will
eliminate contact between bedknife and reel,
avoiding the possibility of damaging the reel or
bedknife during the backlap process. Always make
bedknife adjustments with the Engine Off.
NOTICE
 Make sure the bedknife adjustment is
correct before backlapping. Refer to
Bedknife Adjustment .
2. Slowly turn the restriction valve knob
clockwise until the desired reel rotation
speed is attained. It should be slow
enough so that the reel will not throw off
the backlapping compound as it spins.
3. Apply an even coat of backlapping
compound to the entire length of each
blade of the reel. Use a brush with a long
enough handle to keep you away from the
rotating blades. For best results, use a
handle length which will permit application
of compound while standing in front of the
unit.
4. Once all the blades on the reel are
uniformly sharp, shut off the engine and
switch the reel enable switch to the off
position. Set the reel valve control to the
mow position and close the restriction
valve (all the way clockwise).
NOTICE
 To ensure proper reel rotation, make sure
the restriction valve is completely closed.
5. Wash all of the backlapping compound
from all of the heads. Once they are
thoroughly cleaned and dry, apply a light
film of oil to the cutting edges to help
prevent rust.
6. After backlapping, the bedknife adjustment
should be made again.
1
3
2
A
B
N
Figure 6.6.1
2. Backlap Valve
3. Reel Control Lever
A. Mow Position
B. Backlap Position
N. Neutral Position
 ALWAYS open the restriction
valve before setting the reel
control lever to BACKLAP
position. DO NOT set the reel
control lever to the BACKLAP
position before opening the
needle valve in the bypass
circuit. This will cause the reels
to start turning IMMEDIATELY at
full speed.
 Keep hands, feet and clothing
away from all three reels
whenever the reel control lever
is placed in the backlap position.
When backlap restriction valve is
closed or being closed, all three
reels will rotate in the backlap
direction.
WARNING
1. Open the restriction valve on the reel valve
by turning the knob counterclockwise as
far as it will go (See Fig. 6.6.1).
2. Set the reel control lever to the right for the
backlap position (See Fig. 6.6.1).
1. Start the engine and set the throttle to low
idle. Switch the reel enable switch to the
on position. Lower heads by operating the
paddle or the footswitch.
6 ADJUSTMENT

Jacobsen G-Plex III Specifications

General

Brand	Jacobsen
Model	G-Plex III
Category	Lawn Mower
Language	English