(6) Install adapter (54) over motor shaft and
adapter must be parallel within 0.001 inch. Adapter
align holes with tapped holes in motor.
bore diameter must be 0.315 to 0.318 inch. Adapter
face must be parallel with rotor side of adapter with-
(7) Install pump rotor (52) on motor shaft and
in 0.001 inch per inch.
temporarily tighten rotor setscrew (50). Place o-ring
(53) in groove of adapter (54). Place cam ring in
(15) Inspect rotor and rotor blades for nicks,
position aligning scribe mark. With motor shaft end
scratches and excessive wear.
play taken up in direction of pump, make certain
there is at least 0.002-inch clearance between outer
(16) Inspect seal cage for scored or damaged
face of cam ring and rotor. Move rotor back and
face and for wear. Remove all imperfections by
forth as necessary to produce this clearance, then
lapping, or replace seal cage.
(17) Inspect cam ring and port plate for dam-
aged, scored, or warping. Replace defective cam
ring or port plate.
Make sure that adapter and cam ring are
tightly compressed together when deter-
(18) Replace all gaskets, seal rings, motor
mining 0.002 inch clearance, otherwise,
brushes and vaporizer at each overhaul.
a false reading will be obtained.
(19) Replace all parts that do not meet inspec-
(8) Install pump vane (51) in rotor slots making
sure that grooves in vanes face toward the direction
of rotation. Pump rotates counterclockwise when
(20) Seal faces of adapter and seal cage may
viewing end of port plate (47).
be dressed to remove minor nicks, scratches or
scoring using crocus cloth (Federal specification
(9) Place o-ring (48) in groove of port plate
P-C-458). Remove only material necessary to clean
(47), then position plate against cam ring (49). Align
scribe marks and secure with four setscrews (46).
d. Assembly. Assemble the fuel burning heater
(10) Test heater assembly. Plug threaded
assembly in reverse order of disassembly procedures
ports with caps if pump is not to be assembled in
while observing the following:
(1) Exercise care in replacing quartz rod (13,
e. Testing and Adjustment.
installation, gently move rod up and down to make
(1) Flame Switch Adjustment. Refer to the
sure it moves freely in its stainless steel tube. Also
Operator and Organizational Maintenance Manual for
make sure at least 1/32 inch extends out of tube when
flame switch adjustment procedures.
rod is resting on bottom.
(2) Fuel Regulator Valve Adjustment. Refer to
(2) Assemble motor assembly (67), combus-
the Operator and Organizational Maintenance Manual
tion air inlet (64), inlet plate (62) and combustion
for fuel regulator valve adjustment procedures.
fan (61) before installing burner assembly.
(3) Coolant Pump Testing. After coolant
(3) Make sure lead wire from motor assem-
pump has been overhauled, it shall be tested as
bly is on side of blower opposite nameplate (74)
before drawing it through casing grommet (39).
(a) Install pump and motor assembly into
(4) Make sure all wire leads are connected to
their respective terminals as tagged during dis-
(b) Turn power switch ON and run-in unit
for approximately 15 minutes on 24 volts dc.
(c) Close valve in outlet line. (Make cer-
Coolant pump can not be assembled com-
tain the discharge pressure does not exceed a maxi-
pletely and installed as a separate unit.
mum of 30-35 psi when closing this valve. ) Open and
It must be assembled as it is installed
close valve a few times to check consistency of valve
on short shaft end of motor. Test motor
and pump (paragraph e. (3) before com-
pleting heater assembly.
(d) To check pump for rated flow and pres-
sure, adjust valve in discharge line until a reading of
(5) Install seal spring (58) and seal washer
2 psi is obtained on the pressure gauge. Using a suit-
(57) over end of motor shaft. Place o-ring (55) in
able timer, check for rated flow of 80 gph minimum
seal cage (56), then install seal cage over end of
at 2 psi discharge pressure. Amperage draw should
motor shaft with seal face facing forward.