| Tweet |
Custom Search
|
|
|
||
 (1)
Connecting rod disassembly as follows:
f. Installation. Install by reversing removal instructions.
(a) Drain all oil from crankcase.
(b) Remove piston rod from follower piston
5-50.
Relief Valve
(16).
a. General. A relief valve is installed on the pump
(c) Remove frame end cap (18).
discharge piping to protect the tank and system from undue
(d) Remove capscrews from lower half of
pressure should the automatic switch fail to function.
connecting rod assembly and withdraw lower half from
b. Maintenance and Adjustment. Relief valves are set at
crankshaft journal.
the factory, and when replacing a valve, no adjustment is
(e) Position crankshaft journal at bottom
necessary.
position and withdraw connecting rod and piston follower (16).
c. Removal.
(2) Pump piston.
(1) Disconnect drain line from bottom of relief
(a) To replace leather cups on piston,
valve.
remove water box end plate (8).
(2) Unscrew relief valve from pipe line.
(b) Remove piston with a screwdriver
d. Installation. Reverse the order of removal.
inserted in slot.
(c) Remove the two leather cups from piston.
5-51.
Air Volume Control
(3) Valves.
a. General. The air volume control prevents waterlogged
(a) To replace valve cap springs, remove
and airbound tanks, by maintaining proper air volume at all
capscrew (3) from center of bonnet and lift off bonnet.
times. The air volume control is connected to the snifter valve
(b) Remove cotter pins from discharge
on the pump by copper tubing.
valves, and remove springs and valves.
b. Removal. To replace an air volume control, disconnect
(c) Remove discharge valve plate.
the snifter valve and remove air volume control from tank.
(d) Remove cotter pins from suction valves,
Replace valves and snifter line.
and remove springs and valves.
c. Installation. When air volume in tank is not being
e. Assembly.
maintained, install a new air volume control and install line
(1) Connecting rod.
between air snifter valve and air volume control.
(a) Replace connecting rod if bearing surface
shows signs of scoring or wear.
5-52.
Pressure Switch
(b) Replace follower piston and connecting
a. General. An automatic switch is on the water pressure
rod in crankcase and position connecting rod on crankshaft.
set and maintains the correct amount of water under pressure in
(c) Replace lower half of connecting rod.
the air volume tank. Pressure at which the water is maintained
Replace capscrews which hold bearing halves together and
is adjustable by a rheostat on the switch.
torque to 40 foot-pounds.
b. Maintenance and Adjustment. To increase pressure
(d) Replace frame and cap.
on the system, turn pressure adjusting knob clockwise; to
(e) Screw piston rod into piston.
decrease pressure, turn counterclockwise.
(2) Pump piston.
(a) Replace leather cups between piston
5-53.
Motor
halves.
a. General. The water pressure set prime mover is a 1/3-
(b) Soak cups in warm water so they will
hp, 115-volt dc electric motor equipped with pulley and belt
slide into water box cylinder easily.
drive for driving the water pressure set pump. The motor is
(c) Slide piston into water box cylinder; make
controlled through the air volume control and automatic switch.
sure leather cups are facing correctly as piston slides into place.
b. Maintenance and Adjustment.
(d) Position a screwdriver into slot in piston
(1) Lubricate in accordance with applicable
and screw piston back on piston rod.
lubrication order LO 55-1925-204-12.
(e) Replace water box end plate.
(2) Inspect commutator and brushes. Clean dirty
(3) Valves.
commutator with 00 sandpaper. Replace brushes worn to one-
(a) To replace valve springs, reassemble
half normal length and "sand in" to contour of commutator (TM
both suction and discharge valves in reverse order of
55-506). Adjust brush tension.
disassembly. Install new valve springs during assembly.
c. Removal.
(b) Replace section valves; position a new
(1) Disconnect motor electrical connections.
gasket on water box and replace valve plate.
(2) Loosen belt adjusting screw (20, fig. 5-94)
(c) Replace discharge valves and gasket.
Replace bonnet and tighten bonnet capscrew.
5-129
|
||
|
||
