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308017 19
Service
Reassembly (Refer to Fig. 8)
1. Place a 13 mm (1/2 in.) diameter brass rod length-
wise in a vise. Install a new piston seal (15*) on
the piston seat. Apply thread sealant to the
threads of the piston seat. Place the piston guide
(14) securely on the brass rod. Using a 32 mm
crow’s-foot, screw the piston seat (16) into the
piston guide. Torque to 27–34 N.m (20–25 ft-lb).
2. If it was necessary to remove the priming piston
rod (24) from the piston (13), apply thread sealant
to the threads of the rod. Place the flats of the
piston (13) in a vise. Hold the flats of the rod with a
12 mm wrench, and screw the rod into the piston.
Torque to 45–53 N.m (33–39 ft-lb).
3. Use a vise with soft jaws to hold the displacement
rod (1) by its flats. Install the spacer (33, see the
following note) on the rod. Install the assembled
piston guide/seat on the piston (13). Apply thread
sealant to the threads of the displacement rod, and
screw the piston assembly onto the rod, using a 19
mm wrench on the flats of the piston. Torque to
120–130 N.m (88–95 ft-lb). There will be a small
gap between the top of the piston (13) and the
shoulder of the rod (1).
NOTE: The piston spacer (33) is not required when
pumping fluids with a viscosity greater than 1 million
centipoise.
4. Lubricate the threads of the bleeder valve plug
(35). The plug has two sets of threads. Be sure to
screw the plug completely into the valve body (43).
Torque the plug to 30–38
NSm (22–28 ft-lb).
NOTE: Some models include an outlet nipple (8) and
o-ring (9*). It is not ordinarily necessary to remove
these parts. However, if they were replaced because of
damage, lubricate the o-ring and place it on the nipple.
Screw the nipple into the outlet housing (10). Torque to
70–75 N.m (51–55 ft-lb).
5. Lubricate the o-rings (11*) and install them on the
cylinder (12). Apply thread lubricant to the top
threads of the cylinder. Using a 400 mm wrench on
the flats of the cylinder, screw it into the outlet
housing (10). Torque to 325–354 N.m (240–260
ft-lb).