MAINTENANCE AND SERVICING
AdjustingHold-DownswithStubGuards
To adjust the clearance between hold-downs and knife for
all stub guards, follow these steps:
1. Check the clearances between the center guard
hold-down (A) and knife section with a feeler gauge.
The clearances should be:
• 0.004–0.016 in. (0.1–0.4 mm) at guide tip (B)
• 0.004–0.040 in. (0.1–1.0 mm) at rear of guide (C)
2. If required, adjust clearances as follows:
a. Torquenuts(D)to35ft·lbf(46N·m).
b. Turn the three adjuster bolts (E) as required.
c. Torquenuts(D)to53ft·lbf(72N·m).
3. After adjusting all hold-downs, run header at a low
engine sp eed and listen for no ise due to insu fficient
clearance. Insufficient clearance will also result
in overheating of the knife and guards. Readjust
as necessary.
Figure 5.102: Stub Guards
5.8.8 Knifehead
Shield
The shield attaches to the endsheet and reduces the knifehead opening to prevent cut crop from accumulating in
the knifehead cut-out, especially in severely lodged crops.
The shield(s) and mounting hardware are available from your MacDon Dealer.
IMPORTANT:
Shields should be removed when cutting with the cutterbar on the ground in muddy conditions. Mud may pack
into the cavity behind the shield and cause knife drive box failures.
Installing Knifehead Shield
The knife hea
d shield is supplied in flattened form and can be bent to suit installation on pointed or stub guard
cutterbars a
nd on double-knife headers. Shields are slightly different depending on header size and guard
configuratio
n. Ensure proper shield is used. Refer to the header parts catalog for proper replacement parts.
DANGER
To avoid bodily injury or death from unexpected start-up or fall of raised machine, always stop engine,
remove key, and engage safety props before going under header for any reason.
1. Raise reel fully, lower header to ground, shut down combine, and remove key.
2. Engage reel arm locks.
CAUTION
Wear heavy gl
oves when working around or handling knives.
147695 310 Revision A
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