214323 88 Revision B
Adjusting Feed Draper Speed
The feed draper moves the cut crop from the side drapers into the adapter feed auger.
Figure 3.100: CA25 Combine Adapter
Adapter feed draper (A) is driven by a hydraulic motor and a
pump that is powered by the combine feeder house drive
through a gearbox on the adapter.
The feed draper speed is determined by the combine feeder
house speed and cannot be independently adjusted.
3.7.8 Knife Speed
The header knife drive is powered by the adapter hydraulic pump which is driven by the combine feeder house. There is no
separate adjustment to control the knife speed.
Table 3.8 Feeder House Speed
Combine
Feeder House Speed
(rpm)
Case IH 580
Challenger
®
625
CLAAS
33
420
Gleaner
®
625
John Deere
490
Massey Ferguson
®
625
New Holland
580
IMPORTANT:
For variable speed feeder houses, the rpm values shown at right
represent the MINIMUM feeder house speeds. Reduce the flow
to the knife drive motor if operating above these rpm values to
prevent knife overspeeding and knife failure.
Table 3.9 FD75 Header Knife Speed
Header Size (m
[ft.])
Recommended Knife Drive Speed
Range (rpm)
Single-Knife
Drive
Double-Knife
Drive
9.1 m (30 ft.)
600–700
—
10.7 m (35 ft.)
550–650
—
12.2 m (40 ft.)
525–600 550–700
13.7 m (45 ft.)
—
550–700
IMPORTANT:
Ensure the knife speed is within the range of rpm values in
Table 3.9, page 88. Refer to Checking Knife Speed, page 89.
IMPORTANT:
Under normal cutting conditions, knife speed taken at the
knife drive pulley should be set between 600–640 rpm
(1200–1280 spm). If set to the low side of the range, you
could experience knife stalling.
OPERATION
33. The rear shaft speed on CLAAS combines is 420 (speed shown on cab display monitor also will be 420). The output
shaft speed is actually 750 rpm.
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