HYDRAULIC SYSTEM 777 SERVICE MANUAL
2-30 Published 10-01-2012, Control # 045-08
Operating Speed Checks
Check operating speeds for below listed functions in SETUP
mode with engine running at high idle and control handles
moved fully forward and back.
Load drum speeds are shown on diagnostic screens for each
pump.
Count number of revolutions rotating bed rotates in one
minute to determine swing speed. Make sure crane is in an
area where nothing will interfere with boom or rotating
bed while swinging.
Mark both crawler tumblers and count number of revolutions
they turn in one minute to determine travel speed. Make
sure crane is in an area where it can travel without
interference.
If proper speeds are not indicated, determine cause of
problem and take corrective action.
Table 2-10
Operating Speed
Function Speed
Front and Rear Load Drums
(standard line speed)
52 – 58 rpm HOIST
44 – 55 rpm LOWER
Front and Rear Load Drums
(optional high line speed)
74 – 82 rpm HOIST
66 – 78 rpm LOWER
Auxiliary Load Drum
64 – 71 rpm HOIST
57 – 67 rpm LOWER
Boom Hoist Cylinders
(without boom)
115 seconds (from fully
extended to fully
retracted)
Swing 3 rpm
Travel
10 – 11-1/2 rpm (at
tumbler)
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