Hale MG - Manual (Page 107)

Muscle Pumps
5-43
10) Apply a light coat of general-
purpose grease to the new seal rings
and install in grooves on valve
piston.
11) Slide piston and seal ring
assembly into the valve body
being careful that the seal rings do
not bind or get cut.
12) Install piston-retaining ring into
groove in valve body.
13) Make sure the piston moves freely
back and forth in the valve body.
14) Install valve assembly into
operator panel and tighten
mounting screws.
15) Screw operating knob onto valve
stem.
16) Attach hose or tubing to inlet
fitting of the drain valve.
17) Test operate apparatus and check
drain valve for leaks.
18) Return apparatus to normal
operation.
b. Type DV5 Drain Valve:
(Refer to figure 6-22)
If the type DV5 drain valve is leaking
the seals must be replaced. Replace the
seals using the following procedures:
1) Place apparatus out of service in
accordance with department
procedures.
2) Open all drain valves to make
sure all pressure is relieved from
the pump.
3) Gain access to inlet fittings on the
valve and disconnect the hoses or
tubes from the valve.
4) Holding stem with a pair of pliers,
if necessary, and remove the knob
from the valve stem
5) Loosen or remove screws that
hold valve body to the operator
panel and remove valve assembly
to suitable work area.
6) Remove the piston stop plate from
the valve body.
7) Slide the piston assembly out of
the valve body.
8) Remove the old seal ring from the
valve piston. Also remove the seal
ring that is cemented into the
valve body.
9) Clean all parts and check for
excessive wear or pitting.
10) Apply a light coat of general-
purpose grease to the new seal
ring and install in groove on valve
piston
11) Apply a light coating of 3M
EC847 (or equal) adhesive to the
seal ring groove in the valve body
and install the seal ring into the
groove. Make sure the adhesive is
dry before continuing installation.
12) Slide piston and seal ring
assembly into the valve body
being careful that the seal rings do
not bind or get cut.
13) Install piston stop plate on valve
body.
14) Make sure the piston moves freely
back and forth in the valve body.
15) Install valve assembly into
operator panel and tighten
mounting screws.
16) Screw operating knob onto valve
stem.