DAVID BRADLEY
Spring Clutch (5752 and later)
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These instructions pertain to the spring type clutch found on the 5752, 5756, and 57562 DB tractors.
This clutch featured two asbestos facings which floated between the outer pressure plates and the
clutch pulley. Portions of these instructions are paraphrased from an actual DB manual.
CLUTCH ADJUSTMENT
Adjustment of the clutch is accomplished by adjusting the effective length of the control rod
coming from the handlebar lever. The aforementioned tractor models have a coiled spring attached
to the end of the control rod from the handlebar lever instead of the nuts and spacer arrangement
of the earlier 5751. Adjustment is accomplished by removing the clutch rod from the hole in the
handlebar lever and screwing the spring into (or out of) the clutch throwout lever (15) to adjust
the length of the rod. Adjust by rotating the spring one coil at a time and replacing the rod
into the lever end and testing the clutch. repeat until you find the point where the clutch is
disengaged when the handlebar lever is pulled back and engaged when the lever is forward.
If the facing becomes glazed or covered with grease or oil, it may need to be cleaned. Wash the
facing with gasoline or kerosene and wipe dry. Brake cleaner is a more modern alternative which
also works well. Just be careful of the paint. A glazed surface can be broken up with a wire
brush.
REPLACEMENT AND REPAIR
FACINGS
1) Disengage clutch.
2) Remove groove pin, (9).
3) Remove all burrs from groove pin and shaft.
4) Remove outer clutch plate, facings, and pulley, (10, 11, and 14), by sliding
from shaft.
5) Thoroughly clean all parts of grease and oil.
6) Using new facings, reverse the above procedure to assemble clutch. Be sure to replace the
pulley with the oil cover on the outside In the event new parts are required, be sure that each
part slips freely over the input shaft of the transmission. These parts are precision made and
must slide freely. DO NOT FORCE.
PULLEY BEARING
In the event the bronze bearing in the clutch pulley (4) should need to be replaced,
the manual instructs as follows:
Align new bearing against the old one. Drive out old bearing using a soft wood block.
However, if you have access to, or can make a bearing driver, use the driver in conjunction
with an arbor press (if available) or use a hammer with caution.
THRUST BEARING
1) Remove outer pressure plate, pulley, and facings as outlined above.
2) Slowly engage clutch control rod, which will allow the clutch throwout cup (13), to slide
away from the transmission case.
3) Remove the control rod from the clutch throwout lever, noting position of adjustment.
4) Remove pin (2) from throwout lever yoke (15).
5) Remove the rest of the assembly from the transmission shaft, noting the proper order for
subsequent reassembly.
[Note: When replacing thrust bearing, it is desirable to also replace the inner and outer
thrust washers (6 & 7) as well]
6) To reassemble, first check all new parts to be sure each fits properly on the input shaft
and key.
7) Assemble outer washer (7) and thrust bearing (8) in the clutch throwout cup (13).
8) Place a pea-sized amount of grease in the area around the thrust bearing.
9) Insert inner washer (6) in place against thrust bearing.
10) Insert spring (1) in clutch spring case (12) and place assembled clutch throwout cup
with bearing and washers in position against spring case. Then drop pin (2) into place through
throwout lever (15).
11) Place flat washer (16) on inner clutch plate (3) and position inner clutch plate by
placing right hand on clutch throwout cup and yoke, moving it until inner clutch plate slides
into place on key (5).
12) Replace clutch control rod and adjust throwout lever to same position as before.
13) Disengage clutch lever, which will compress the spring to allow the rest of the parts to
be reassembled on the shaft.
14) Drive groove pin (9) in place.
15) Check and adjust clutch as necessary (see instructions above).
This style of clutch was used on the following models: 5752, 5756, and 57562.
Since 1/2/4