8. Rotate Crankshaft to extend new Piston Rod. Proceed
as above with second and third Cylinders. Proceed with
standard Piston Pump Servicing.
■
Hi-Temp Models
Before installing the Inlet Valve in the Model 2520C, be
certain the spacer is installed first, then proceed with
standard Inlet Valve, Roulon Piston Assembly, Piston
Spacer, Piston Retainer, Washer, Nut and Cotterpin.
SERVICING SLEEVES AND SEALS
Disassembly
1. Remove Discharge Manifold and Piston Assemblies as
described.
2. Remove Inlet Manifold containing seals.
3. Grasp Sleeves and with a pulling and twisting motion
remove the Sleeve from the Piston Rod.
NOTE: Grasp Sleeve with pliers only if replacing
worn Sleeves, as the procedure will mar the
Sleeves.
4. Remove Seal Retainer.
5. Remove and examine O-Rings and/or Back-up-Rings
on Piston Rod for wear and replace as needed.
Reassembly
1. Visually inspect that Barrier-Slinger is in position.
2. Lubricate new O-Rings and/or Back-up-Rings and slip
onto Piston Rod. Install the first O-Ring (A) in the
groove on the Piston Rod. Next position Back-up-Ring
(B) against the stepped shoulder. Then install the
second O-Ring (C). Exercise caution as you slip the
O-Ring over the thread end of the Piston Rod.
NOTE: The Model 390 pump does not have a sleeve
Back-up-Ring and has only one sleeve O-Ring which
is installed in the groove on the Piston Rod (A).
SERVICING THE PUMPING SECTION
■
Sleeved-Type Piston Models
Disassembly
Models 6024-6044 have special cylinder adapters,
sleeved-type pistons and V-packings instead of piston-cup
assemblies.
1. After removing the Discharge Manifold, slip Cylinders
off Piston Rods. It is best to leave the Cylinder Adapters
and Springs in the Inlet Manifold as they may score the
sleeved-type Pistons when removed. The V-packings
will remain in the Cylinders.
2. Press worn V-packings from Cylinders.
3. Remove Cotterpins, Slotted Nuts, Washers and Piston
Retainers. Pull sleeved-type Pistons from each Piston
Rod. Next slip sleeved-type Spacer and Inlet Valve
from each Piston Rod.
4. Lubricate and install new O-Rings on Cylinders and
Adapters.
5. Inspect Inlet Valve surfaces. If Inlet Valves are worn,
lap with 240 grit paper or replace if evidence of
excessive damage. If sleeved-type piston inlet surface
is worn or the outer diameter is scored, replace it.
Reassembly
1. First install Inlet Valve then sleeved-type Piston onto
piston Rod with the lapped end toward the inlet
valve.
2. Install the sleeved-type Spacer.
3. Install new V-packings in the Cylinder in the following
order:
a. Install all parts in one Cylinder, then move to the
next Cylinder.
b. Rotate Crankshaft to extend one Piston Rod
completely forward.
c. Lubricate V-packings and Cylinder I.D. and place
O-ring end of cylinder on work surface.
d. Install into Cylinder Female Packing Spacer, black
Female Adapter, V-packings, nylon Male Adapter
and Male Packing Spacer with “V” side down.
e. Install Spring in outer end of Cylinder and slip
Cylinder Assembly over Piston Rod end. Press
Cylinder into manifold chamber. The Spring in the
Cylinder will be in your palm as the Cylinder
Assembly is installed. Use the Spring to hold parts in
Cylinder as it is slid over Piston Rod.
4. Remove Spring from Cylinder, install Retainer, conical
Washer, Slotted Nut and torque per chart.
5. Install new Cotterpin and bend ends back.
6. Replace Spring in Cylinder.
7. Lubricate inlet and discharge ends of adapter and
install Back-up-Rings first, then O-Rings onto adapter.
Lubricate O. D. of small diameter inlet end of adapter
and press into Cylinder.
