Grove Published 11-10-2014, Control # 524-00 2-13
RT880E SERVICE MANUAL HYDRAULIC SYSTEM
Hydraulic Pumps
Pump No. 1 and 2 are mounted off drive pads of the torque
converter (Figure 2-6).
The purpose of these pumps is to convert mechanical
energy into fluid energy for the operation of the crane’s
hydraulic components.
Pump No. 1 is a variable displacement, pressure
compensated load sense piston pump @ 8.85 in
3
/rev (145
cm
3
/rev) delivering a theoretic flow of 96 gpm (363 lpm) @
2500 engine RPM. It has an integral inlet impeller to insure
proper self-priming. The pump differential or standby
pressure is 275 psi (1896 kPa/19 bar). Pump No. 1 supplies
oil to the outrigger, rear steer, axle lockout, boom lift,
telescope, hoist, and pilot functions.
Pump No. 2 is a single positive displacement gear pump @
3.48 in
3
/rev (57 cm
3
/rev) delivering a theoretic flow of 38
gpm (144 lpm). Pump No. 2 supplies oil to the front steer and
swing circuits.
Item Description
1 No. 1 Pump
2 No. 2 Pump
3 Transmission
4 Engine
Front of Crane
FIGURE 2-6
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