JLG 601S, Service And Maintenance Manual

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SECTION 3 - CHASSIS & TURNTABLE
3-60 – JLG Lift – 3120746
Check-Out and Initial Start-Up Procedures
Before proceeding, familiarize yourself with the locations
of the various adjustment pots. There are two types of
adjustment pots.
Multi-Turn Adjustment (High Engine, Mid
Engine, Overspeed, Starter Lockout)
This adjustment is made by turning the 1/8" brass screw
clockwise (CW) to increase speed, and counterclockwise
(CCW) to decrease speed. The adjustment range of the
pot is 25 turns, and one full turn will change speed about
100-200 rpm. This pot is protected by a slip clutch at each
end, and will not be harmed by moderate over-adjust-
ment. However, the Governor will not function while the
pot is past full travel. If you suspect you may have over-
adjusted the High Engine pot, or have lost track of where
you are, turn the pot 25-30 turns CCW, then back 10-12
turns CW to get back into the range of normal adjustment.
Single-Turn Adjustment (Gain, Factory
Adjust)
This pot is 3/8" square and has a 1/8" plastic screw in its
center. Be gentle! This pot turns 270 degrees, and over-
turning will break the internal stops, making adjustment
impossible. Turning this pot CW increase Governor sensi-
tivity. On most applications, best operation is achieved
with the pot set as shown in diagram below.
NOTE: These settings are factory set, Start Lockout, Fac-
tory Adjust and Overspeed. They are conformally
coated by P.G. and should not need to be reset.
Assuming that the Actuator and Controller are mounted,
the wiring is run and checked, and that the linkage is
properly installed, proceed as follows: