Hydraulic Comparison Test Pump
Maintenance and Servicing
11
Priming Pump Assembly
Disassembly
1.
On the underside of the top plate, disconnect the hydraulic tubing from the pump
block assembly (14).
2.
On the upper side of the top plate, unscrew locknut (3) ½ turn, and remove clip pin
from clevis (2).
3.
The pump arm assembly can be swung out of the way.
4.
Remove locknut (3) and clevis (2).
5.
Unscrew union nut (4), and withdraw pump assembly from below the top plate.
6.
Withdraw pump shaft (6), taking care not to drop shaft bearing (5) or rambler
assembly (8).
7.
The white, anti-extrusion ring (9) is a PTFE spiral, and can be removed by
“unwinding” it from the rambler.
8.
When removing the rambler seal (10), take care not to use any tool that may have a
sharp edge that will scratch the surfaces of the groove in the rambler, otherwise it
may leak when reassembled.
9.
The replacement rambler seal can be eased over the front of the rambler, and into the
groove.
10.
Similarly, the new anti-extrusion ring can be “wound” into the groove in the rambler,
behind the rambler seal.
11.
If it is necessary to remove the barrel (12), the locknut (11) must be loosened
approximately ½ turn. The barrel can then be unscrewed from the pump block
assembly (14).
Reassembly
1.
Before re-fitting the barrel, ensure that the O-ring (13) is correctly located in the
counter-bore in the front of the barrel. Screw the barrel fully in to the test station, and
secure with the locknut.
2.
Ensure that the rambler assembly is correctly located on the end of the pump shaft.
Carefully introduce the rambler into the open end of the barrel; making sure that it
does not tilt when entering the barrel.
3.
Slide the pump bearing (5) over the shaft, and locate it inside the barrel.
4.
Re-introduce the pump assembly from the underside of the top plate, and secure with
the union nut (4).
5.
Replace locknut (3) and clevis (2), reconnect pump arm assembly, and secure with
pin clip.
6.
Reconnect hydraulic tubing.
