Operator`s manual

AMERICAN-LINCOLN 1-49
7760
TRANSMISSION
ARM
SPERCO ROD END
1/4 - 28 JAM NUT
THREADED ROD
1
/
4-2
8J
AM N
U
T
CENTERING CONTROL
ADJUSTMENT NUT
P-5093 FIGURE 42
GENERAL MACHINE MAINTENANCE
LP GAS SYSTEM
The propane powered Model 7760 is identical to the “standard” gasoline powered 7760, except that its fuel system
has been modified to operate on LP vapor fuel.
The LP fuel system consists of several components not found on the gasoline system. The LP fuel system also
contains the associated mounting hardware and plumbing for the LP components. The major LP components are
as follows: These components are factory set, attempts at adjusting these components should only be made by
authorized service personnel.
1. An LP carburetor
2. A combination water heated vaporizer and regulator
3. A combination LP fuel line filter and lock off valve
4. An LP fuel tank and fittings
LP GAS VAPORIZER-REGULATOR QUICK CHECK
Turn on the ignition switch and open the radiator cap. Check the coolant for bubbles. If bubbles are present, the
vaporizer may have a leaking gasket or may have developed a pinhole leak, allowing the LP fuel to enter the cooling
system.
LP GAS FUEL TANK
The LP tank is located under the driver’s seat. Use only the proper size and type of LP tank. The 7760 LP powered
sweeper uses 33.5 lb. liquid withdraw tank. The DOT designation of the tank is DOT 4BW-240.
NEUTRAL ADJUSTMENT
NOTE
Orientation of the transmission arm assembly depends upon which engine is installed in the 7760
Sweeper Scrubber. See pages 120 through 125 for proper identification.
NOTE
Adjustment directions given are as seen from the operator’s position in the driver’s seat.
1. Check engine no load RPM; 7760, 2150 RPM. Check hydraulic reservoir oil level.
2. Raise rear of machine onto jack stands so rear wheel is off the ground.
3. Loosen the jam nut away from the adjustment nut.
4. If the rear drive wheel is turning forward, turn the adjustment nut clockwise (this will shorten the threaded
shaft). If the rear drive wheel is turning in reverse, turn the adjustment nut counter clockwise (this will
lengthen the threaded shaft).
5. Tighten the jam nut against the adjustment nut.
6. Test for operation of neutral with engine at full throttle. If the rear drive wheel turns, repeat adjustment steps
3, 4 and 5.