Greenlee Textron / Subsidiary of Textron Inc.
18
4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
976-22, 980-22 Hydraulic Power Pump
Hydraulic Schematic
1
Intake strainer, #50 mesh brass screen
2
Low-pressure pump — 3.4 liters/min. (208 in
3
/min)
at 3000 rpm (100%)
3
Low-pressure relief valve — 19 Bar (275 psi)
located in pilot-operated valve
7
Piston
4
Low-pressure bypass check valve
5
High-pressure pump
976-22: .25 liters/min. (15 in
3
/min) at 2850 rpm (100%)
980-22: .73 liters/min. (45 in
3
/min)
6
High-pressure relief valve
717/690 Bar (10,400/10,000 psi)
7
Pilot-operated directional control valve
3 way, 2 position
8
Manually operated check valve
9
Female coupler half
6
8
7
3
4
9
5
2
1
Service (cont’d)
Driv-Lok Pin
Seal the Driv-Lok pin (73) to the pump block (84) with
a 1.5 mm (1/16") bead of an RTV-type silicone-based
sealant, such as Dow Corning 732™ Multipurpose
Sealant or equivalent.
Sealing Instructions for Assembly
Motor
If the motor has been disassembled, seal with a 3 mm
(1/8") bead of a silicone-based gasket/flange sealant,
such as Loctite
®
587 Ultra Blue
®
, as follows:
(A) To the mounting surface around the threads
(four locations)
(B) To the chamfer (four locations)
(C) Around the innermost machined circumference
of the mounting surface
Apply a 1.5 mm (1/16") bead of an RTV-type silicone-
based sealant, such as Dow Corning 732™ Multipurpose
Sealant, as follows:
(D) Around the motor bearing screws (two locations)
Assemble immediately.
73
84
A
B
D
C
