Section II. HYDRAULIC PUMP AND DRIVE COUPLING
(1) Block t h e r o c k d r i l l b o o m a n d f e e d
mechanism in the horizontal position.
This section contains repair instructions for the
(2) Loosen a hose connection at the pump
hydraulic pump and drive coupling. The
and allow hydraulic oil to bleed into a suitable
h y d r a u l i c pump is a high capacity vane type
pump, driven by an air motor through a coupling.
The pump provides all power for the hydraulic
the air motor.
(4) Remove the hydraulic pump and pump
3-18. Hydraulic P u m p and Drive Coupling,
drive c o u p l i n g i n numerical sequence as
Removal and Disassembly
Figure 3-11. Hydraulic pump and drive coupling, removal and installation.
b. Disassembly. Disassemble the hydraulic
pump and pump coupling in numerical sequence