JLG 740A, Service And Maintenance Manual

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SECTION 1 - SPECIFICATIONS
1-4 – JLG Lift – 3121160
1.14 FUNCTION SPEEDS
Machine Orientation When Doing Speed
Tests
Tower Lift: Upper Boom Horizontal, Telescoped In. Tower
Lift Up, Record Time. Tower Lift Down, Record Time.
Lift: Tower Lift Fully Elevated, Tower Telescope Fully
Extended, Main Telescope Fully Retracted.
Swing : Boom at Full Elevation. Telescope Retracted.
Swing the Turntable off center and stop. Swing the oppo-
site direction and start the test when the turntable is cen-
tered up. This eliminates ramp up and down on the
controller affecting times.
Telescope : Boom at Full Elevation; Telescope Retracted;
Telescope Out, Record Time. Telescope In, Record Time.
Drive (Forward/Reverse) : Test should be done on a
smooth level surface. Drive Select Switch should be set to
High Engine. Start approximately 25 ft. (7.62 m) from the
starting point so that the unit is at maximum speed when
starting the test. Results should be recorded for a 200 ft.
(60.96 m) course. Drive Forward, Record Time. Drive
Reverse, Record Time.
Drive (Above Horizontal): Test should be done on a
smooth, level surface. Drive Select Switch should be set to
Low Engine, Low Drive. The Platform Speed Knob control
should be positioned to Creep Speed. This simulates
machine speed when the boom is above horizontal.
Results should be recorded for a 50 ft. (15.2 m) course.
Drive Forward, Record Time. Drive Reverse, Record Time.
Platform Rotate : Platform level and completely rotated
one direction. Rotate the opposite direction, Record Time.
Rotate the other direction, Record Time.
Articulating Jib : Platform level and centered with the
boom. Start with the Jib down. Jib Up, Record Time. Jib
Down, Record Time.
Test Notes
1. Stop watch should be started with the function, not
with the controller or switch.
2. Drive test results reflect 15x19.5 or 18x19.5 tires,
pneumatic or foam filled.
3. All speed tests are run from the platform. These
speeds do not reflect the ground control operation.
4. The platform speed knob control must be at full
speed (turned clockwise completely).
5. Function speeds may vary due to cold, thick hydrau-
lic oil. Test should be run with the oil temperature
above 100° F (38° C).
6. Some flow control functions may not work with the
speed knob clicked into the creep position.
Table 1-17. Function Speeds
Function Speed (In Seconds)
Main Lift Up 45 - 50
Main Lift Down 45 - 50
Swing Right & Left 79 - 101
NOTE: No more than 10% difference between swing left
and swing right.
Main Telescope In
800A
800AJ
30-40
24-34
Main Telescope Out
800A
800AJ
35-45
30-40
Platform Rotate Right & Left 19 - 30
NOTE: No more that 15% difference between rotator left
and rotator right.
Jib Up & Down 16-22
Tower Lift Up 57 - 70
Tower Lift Down 44 - 53
Drive (2WD) Forward & Reverse 33-45
Drive (4WD) Forward & Reverse 33-45
Drive Above Elevation
2WD Forward & Reverse
Min 61
Drive Above Elevation
4WD Forward & Reverse
Min 122
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