HYDRAULIC SYSTEM GRT880 SERVICE MANUAL
2-18
Published 10/19/2017, Control # 618-00
HYDRAULIC PUMPS
Description
The No. 1 and No. 2 hydraulic pumps are mounted to the
torque converter (Figure 2-4). The No. 3 pump is mounted to
the engine.
The purpose of these pumps is to convert engine and torque
converter mechanical energy into fluid energy for operation
of crane hydraulic components.
Pumps No. 1 and No. 2
NOTE: Pump output figures are theoretical.
The No. 1 and No. 2 hydraulic pumps are variable
displacement piston pumps with SAE-C 2-bolt mounting
flanges. Each pump has a displacement per revolution of
85 cc (5.19 cu-in) and an output of 204.4 l/min (54 gal/min)
at 2500 rpm. The displacement of both pumps is controlled
by load sense lines.
Pump No. 3
The No. 3 hydraulic pump is a positive displacement, gear-
type pump with SAE-B 2-bolt mounting flanges. Pump
displacement per revolution is 36.1 cc (2.20 cu-in) and
output is 86.7 l/min (22.9 gpm) at 2500 rpm.
Reference Only
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