48 CropHawk Draper Platform Operators Manu-
Drive System
Adjustments
Knife Timing
IMPORTANT: Incorrect knife timing causes excessive vibration of the
platform.
Knife is timed correctly when both knife heads are at their outermost at the
same time. This can be seen by lining the grease nipple (A) on the knife drive
directly below the indentation (B) provided on the flywheel (see image).
To Set Knife Timing:
1.
Rotate knife drive on one end until knife is in the fully out position.
2.
If knife drive on the opposite end is not in the same position,
loosen the
tensioner idle pulley anchor bolt (C) and tensioner lock nuts (D) on
knife drive belt tensioning idler pulley.
3.
Raise pulley to highest position, slip drive belt over teeth until knife
drive is in desired position.
4.
Re-tension drive belt,
tighten idle pulley anchor bolt (C) to 271nm (200
ft-lb) and tensioner lock nuts (D) adjuster nuts to 43nm (32 ft-lb) .
Finer adjustment can be achieved by loosening 5 bolts on the adjustable flange
(E) located next to the oil tank and changing flange position. Re-tighten flange
bolts to 142nm (105 ft-lb).
B
A
C
D
E
Knife Clutch Pressure Adjustment:
The knife clutch is designed to slip only if an obstruction jams the knife. To check if knife clutch is slipping un-
der normal harvesting conditions, mark a line across from the clutch across the pressure plate to the ad-
juster ring (A). Check line after a suitable period of operation.
IMPORTANT: Premature failure will occur if clutch is slipping
under normal cutting conditions.
To Adjust Knife Clutch Pressure
1.
Loosen tension on drive belt (refer to DRIVE BELT
ADJUSTMENT).
2.
Loosen 3 clutch adjuster ring tensioner bolts (B).
3.
Turn adjuster ring (C) clockwise to apply more pressure or
anti-clockwise to release pressure.
4.
Tighten 3 clutch adjuster ring tensioner bolts (B) to 1mm from
bottoming.
5.
Re-tension drive belt (refer to DRIVE BELT ADJUSTMENT in this manual).
A
B
C
NOTE: Front cover removed for clarity
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