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Maintenance
Due to their design and intended application,
maintenance difficulties are not expected to be
encountered with these valves. If they fail to perform in
a satisfactory manner, it may be due to accumulation
of dirt in one or more of the parts. If necessary to
disassemble, proceed as follows, after: (1) shutting off
supply pressure; and (2) relieving spring compression by
backing off the adjustment screw.
Remove the four body cap screws (16); body cap (15),
body cap O-ring (14), range spring (3), upper spring
button (2) and spring case (9) will come free from body (7).
To free diaphragm S/A (10) and inlet valve S/A (12) from
the body, place the wrench on the insert retainer (13) and
unscrew from the body insert (5). Remove the body insert
O-ring (6) and slide the diaphragm S/A, the body insert
and the inlet valve S/A from the body. Holding the inlet
valve from turning, unscrew inlet valve locknut (4) and
remove diaphragm S/A from the inlet valve. Turn the inlet
valve out of body insert.
Check all ports to be sure they are clear of dirt. Inspect
Prior to performing maintenance on the Air Lock-up
Valve, shut off the supply pressure and remove the
spring compression by backing off the adjustment
screw.
It is recommended that the Air Lock-up Valve be
removed from the line for repairs.
Signal Pressure
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the diaphragm S/A for rupture or for damage around the
edge. If necessary, install a new diaphragm S/A. Check
the inlet valve for wear. If the inlet valve is roughed-up or
pitted, replace with new one.
To reassemble the lock-up valve, perform all operations
in reverse order to that used in disassembly. Note: The
O-ring on the inlet valve stem should be lubricated before
the inlet valve is reassembled in the body insert.
Note: Considering the high labor costs involved in
replacing internal parts, it may be more economical
to stock complete units.
Ref.
Qty
Part Name
1
1
Adjusting Screw
2
1
Upper Spring Button
3
1
Range Spring
4
1
Inlet Valve Locknut
5
1
Body Insert
6
2
O-Rings
7
1
Body
8
1
Locknut
• Not visible in cutaway view.
16
Ref.
Qty
9
1
10
1
11
1
12
1
13
1
14
1
15
1
• 16
4
Masoneilan 77-6 Model Air Lock-up Valve Instruction Manual | 5
Part Name
Spring Case
Diaphragm S/A
Inlet Valve O-Ring
Inlet Valve S/A
Insert Retainer
Body Cap O-Ring
Body Cap
Body Cap Screws
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