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Hydraulic
Excavators
7-206 Edition 47
WorkingWeights
●
Bucket Fill Factors
●
Bucket & Payload
BUCKET PAYLOAD
An excavator’s bucket payload (actual amount of
material in the bucket on each digging cycle) is dependent
on bucket size, shape, curl force, and certain soil char-
acteristics, i.e., the fill factor for that soil. Fill factors for
several types of material are listed below.
Average Bucket Payload =
(Heaped Bucket Capacity)
×
(Bucket Fill Factor)
Material
Fill Factor Range
(Percent of heaped
bucket capacity)
Moist Loam or Sandy Clay
A
— 100-110%
Sand and Gravel
B
— 95-110%
Hard,Tough Clay
C
— 80-90%
Rock —Well Blasted
60-75%
Rock — Poorly Blasted
40-50%
WorkingWeights — Bucket & Payload
The following tables give maximum “bucket plus
payload” weights to assist in selecting the correct bucket
for a specific application. These weights are based on
actual job conditions. In better than average conditions
the excavator may be able to achieve rated lift capacities
listed in this section.
NOTE:
Bucket sizes are suitable for a maximum mate-
rial density of 1800 kg/m
3
(3035 lb/yd
3
). Payloads
shown are calculated at 1500 kg/m
3
(2530 lb/yd
3
).