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11.1 Adjusting the Dump Valve ‘Udder’
“Udder” refers to the amount the dump valve bulges out
below the bucket shell, when the bucket is full.
Dump valve “udder” adjustment has a significant effect
on the valve seal between the fabric dump valve itself
and the bucket shell.
Ninety percent of the valve seal is produced by the
stainless steel bolts passing through the neoprene foam
and the bucket. The balance of the sealing action is a
result of the valve “uddering” out the bottom of the bucket
and compressing the foam between the valve and the
bucket.
A properly adjusted dump valve will have a maximum of
3" (76 mm) of ‘udder’. Too much “udder” will add to the
volume and thus the weight of the bucket. Too little ‘udder’
will prevent the secondary sealing action and will result
in the valve leaking. Correct dump valve adjustment is
shown in Fig. 12.
11.2 FCAS and Valve Sealing
The Frusto-Conical Arrest System (FCAS) involves the
use of a cinch strap to reduce the volume of the bucket.
Use of the FCAS cinch strap at minimal bucket volume
may result in some loss of the secondary seal because
of the sidewalls of the bucket being more vertical (ideal
sealing results from the angle between the sidewall of
the bucket and the valve fabric being close to 90
degrees).
11.3 Adjusting “Udder” via Trip Line
Each new Bambi Bucket is adjusted and checked at the
factory under full fill for proper dump valve adjustment.
To adjust the “udder”; change the length of the trip line
by adjusting it at the trip line adjustment chain.
There are two methods of securing the trip line at its
adjustment chain on Bambi Buckets. On Models 8096
to 1821, the adjustment chain is secured to the
suspension bolt on the control head. On Models 2024
to HL9800, the adjustment chain is located at the top of
the trip line riser.
If a new trip Iine is installed, first instalI at the same
point on the adjustment chain and then test the dump
valve in use. Remember to secure the adjustment
shackle with a lockwire or tie wrap first. It is impossible
to judge “udder” with an empty bucket on the ground.
11.4 Adjusting “Udder” Following Shorten-
ing of Suspension Cables
Whenever the length of the main suspension cables are
modified (See Section 3.4), the trip line should also be
modified. For Models 8096 to 1821, which have a pulley
on the trip line, modify the trip line by double the amount.
For Models 2024 to HL9800, modify the trip line “riser”
by the same amount as the suspension cables. The
riser should then be attached with the adjustment chain
in the original position. A final check for “udder” should
then be made when the bucket is full.
11. ADJUSTMENTS
Fig. 12: Cross section view of Bambi Bucket showing
correct amount of ‘udder’.
3" (76 mm) "UDDER"
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