Check Valve Reassembly - Milton Roy PRIMEROYAL Instruction Manual

Disassembly:
1. Disconnect motor power supply.
2. Remove covers. Drain oil from pump casing.
3. Unbolt and remove gland.
4. Loosen plunger adapter.
5. Remove liquid end from pump drive. (Step 1 of "Packing Replacement").

Check Valve Reassembly

Reassemble check valves as follows.
1. Install O-rings (225) in grooves in each seat (224-B). Make sure the ends of split
rings overlap in the seat grooves.
2. Place a ball-check (407-D) in one seat.
3. Install limit pin (292) in seat with ball-check. This assembly will be the lower seat assembly.
4. Coat seat O-rings with Teflon® spray or other lubricant. Position lower seat assembly in
the top of the check valve body (221-K) with the limit pin at top. Press lower seat
assembly into check valve body till it is flush with top of valve body.
5. Place a ball-check in the remaining seat and install the limit pin in this seat.
6. Position second (upper) seat assembly in top of check valve body with limit pin at top
and press this upper seat assembly into check valve body (forcing lower seat further
down under it) till it is flush with top of valve body.
7. Place a piece of bar stock equal to the inside diameter of the check valve body on top of
the upper seat. Press bar stock to drive both seats down into the check valve body until
lower seat bottoms in valve body counterbore. (Top seat will be recessed slightly from top
of valve.)
Figure 3. Check Valve Parts.
Most 1-1/8" and smaller diameter plunger pumps.
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