Gasboy XU2A - Manual (Page 19)

MDE-4320 Gasboy UHF Pump, Blackmer® XU2A Rebuild Kit Installation Manual • June 2004 Page 19
Pump Maintenance
rotor and shaft.
1 Reassemble the outboard side of the pump first.
a. For a clockwise rotation pump, position the pump cylinder with the intake port to the
left.
b. For a counterclockwise rotation pump, position the pump cylinder with the intake port
to the right.
2 Apply a small amount of quality O-ring lubricant in the head recess. With new O-rings
installed, push the mechanical seal assembly (153) into the recess of the head with the seal
jacket drive tangs inward. The pin in the seal stationary seat must between the lugs in the back
of the head recess.
3 Apply a small amount of quality O-ring lubricant to the O-ring groove on the inside face of the
head to facilitate installation. Install a new head O-ring (72) in the groove by laying the O-ring
flat and starting in on one side of the groove, stretching ahead with the fingers as show in
Figure 4:Head O-Ring Installation .
4 Install the head (20) on the outboard side of the cylinder. Install and snug up four head
capscrews (21) 90° apart.
5 Hand pack the ball bearing (24) with grease. Refer to "Lubrication" in the Pump Maintenance
Section for the recommended grease.
6 Install the bearing into the head recess. The bearing balls should face outward with the grease
shield inward. Ensure that bearing is fully and squarely seated against the mechanical seal.
7 Turn the pump cylinder around and begin assembly on the opposite inboard end.
8 Remove the vanes (14) and push rods (77) from the rotor and shaft assembly. Inspect for wear
and damage and replace as follows:
a. Partially install he non-driven end of the rotor and shaft (13) into the open side of the
pump cylinder.
b. Leave part of the rotor outside of the cylinder so that the bottom vanes can be installed
and held in place as the push rods are installed in the push rod holes of the rotor. Insert the
new vanes into the rotor slots with the rounded edges outward and the vane relief grooves
facing towards the direction of rotation. Refer to
Figure 2:Vane Installation .
c. After the bottom vanes and push rods are installed, insert the rotor and shaft fully into
the cylinder.
d. Install the remaining vanes into the top positions of the rotor. Rotate the shaft by hand to
engage the drive tangs of the mechanical seal jacket in the rotor slots.
9 Apply a thin coating of quality O-ring lubricant on the inboard shaft to aid installation.
Installation. Install the inboard head, mechanical seal, and bearing as instructed in steps 2
through 6.
10 Rotate the shaft by hand to engage the seal drive tangs, and to test for binding or tight spots. If
the rotor does not turn freely lightly tap the rims of the heads with a soft faced mallet until the
correct position is found. Install all of the remaining head capscrews for each head and
uniformly tighten , torquing to 25lbs ft (34 Nm).
11 Inspect the grease seal for wear or damage and replace as required. Grease the outside