John Deere 5310 S - Manual (Page 42)

Operating the Engine
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Observe Engine Work and Idle Speeds
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Slow idle speed should be 800-875 RPM. At light or no
load, full throttle speed will increase to 2500 RPM.
Normal working speed is 1600—2400 RPM rated speed.
Within these limits engine can be put under full load.
For correct PTO speed, run engine at 2376 RPM for
standard 540 RPM operation (load requiring full engine
power).
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Working With Speed/Hour Meter
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A—Hourmeter
B—2376 RPM Mark (540)
C—Tachometer
Tachometer (A) shows engine RPM, read in hundreds.
For 540 RPM PTO speed, increase engine speed until
tachometer needle is aligned with 2376 RPM mark (B).
Hour meter (C) shows hours of operation in full hours and
tenths.
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