MR--04836
PA SERIES PUMPS
MAINTENANCE & REPAIR
PAGE C -- 17
Discharge Check Valve Assembly And
Installation
(Figure C--1)
The flapper and gasket are the only serviceable
parts of the check valve. If the flapper requires re-
placement, remove the hardware securing the
cover and gasket. Separate the valve cap and re-
place the flapper.
Install the valve cap gasket and secure the cap with
the previously removed hardware.
Support the discharge check valve assembly (5)
using a sling and a suitable lifting device. Using the
hardware (6 and 7) secure the discharge check
valve assembly and gasket (8) to the pump assem-
bly (1).
Priming Chamber Assembly And Installation
(Figure C--3)
If the check valve (26) was disassembled for re-
placement, install the valve weights (30 and 32) on
either side of the check valve and secure with the
hardware (28, 29, 31 and 33).
NOTE
The sealing washer (33)
must
be positioned
against the head of the capscrew (31).
If the valve strap (25) was removed, install the strap
protector (34) and position the replacement strap
over the valve body studs (9). Wrap the strap com-
pletely around the valve body (7) and secure with
the nuts (10).
Position the strap between the guide plates (19)
and clamp plate (24), and secure with the hard-
ware (20, 21 and 22).
Position the valve neck (2) and gasket (6) over the
hole in the top of the priming chamber lid. Position
the check valve assembly over the studs (5) with
the large weight (32) facing up. Slide the studs up
through the holes in the priming chamber lid and
secure with the hardware (3 and 4).
Apply “Loctite Threadlocker No. 242” or equivalent
compound to the capscrews (11). Secure the float
(17) to the valve strap bracket assembly (23) with
the hardware (11 and 12).
Apply 3-M Scotchgrip Adhesive No. 847” or equiv-
alent compound to the gasket strip (8) and install it
in the groove in the priming chamber lid (1).
NOTE
Cut the lap joint where the two ends of the gasket
strip meet at a 45
_
angle.
Lower the float into the priming chamber and se-
cure the lid with the previously removed capscrews
(not shown).
(Figure C--1)
Install the gasket (2) and use a sling and suitable
lifting device to position the priming chamber as-
sembly against the pump suction flange. Secure
the priming chamber assembly with the nuts (4).
Reconnect both the suction piping and the air dis-
charge tubing to the priming chamber assembly.
Final Pump Assembly
(Figure C--2)
Turn the shaft to make sure that the impeller is not
binding or scraping. If it does, check the installa-
tion of the wear ring and balance ring, or remove
adjusting shims until the impeller rotates freely
when the pump is fully assembled.
Be sure
the pump and intermediate are secure to
the engine and the base.
Install the suction and discharge lines and open all
valves. Make certain that all piping connections are
tight, properly supported and secure.
Be sure
the pump and engine have been properly
lubricated, see
LUBRICATION
.
LUBRICATION
(Figure C--3)
Seal Assembly
Check the oil level regularly through the sight
gauge (33) and maintain it at the middle of the
gauge. When lubrication is required, add SAE No.
