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 d. Disassembly.
CAUTION
(1)
Pull coupling hub from pump shaft. Remove key
Extreme care must be exercised when
(14).
handling seals to prevent damage to
(2)
Remove end cover mounting bolts (12) and pull
sealing faces,
end cover (11) from rotor shaft. Remove gasket (10).
(3)
Press oil seal (13) from end cover (11).
(4)
Place spacer (9) in position on power rotor (15).
(4)
Carefully withdraw power rotor assembly (6, 8,
(5)
Pack ball bearings (16) with grease in
9, 15, 16, 17, and 19) from pump.
accordance with MIL-L-15719A.
(5)
Remove bolts (20) and remove outboard pump
(6)
Press bearing (16) on rotor shaft.
case (2) and one gasket (4).
(7)
Install remaining snap ring.
(6)
Remove idler rotor (1).
(8)
Place gasket in position on inboard pump case
(7)
Remove rotor housing (3) and remaining gasket
(5).
(4).
(9)
Install rotor housing (3).
(8)
Remove inboard snap ring (17) from power rotor
(10) Install idler rotors (1).
shaft.
(11) Place gasket (4) on outboard side of rotor
(9)
Press spacer (9) and bearing (16) from shaft.
housing (3).
(10) Remove remaining snap ring and slip stationary
(12) Install outboard pump case (2) and fasten pump
seal (8) from power rotor (15).
case (2), rotor housing (3), and pump case (5) with bolts (20).
(11) Rotating seal (6) is a separate assembly
(13) Press oil seal (13) into end cover (11).
containing bellows and carbon ring. Work carbon ring out of
(14) Carefully insert power rotor (15) into pump, and
retainer and off rotor shaft. Normally there will be no need to
seat spacer firmly against shoulder in case (5).
remove spring and bellows, but if necessary to remove, work
rubber bellows off shaft.
CAUTION
e. Cleaning and Inspection.
Exercise extreme care when inserting
(1)
Inspect pump rotor for shipping or wear. Replace
power rotor to prevent damage to O-ring
pump assembly if rotors are defective.
(19) when passing it over venthole (18).
(2)
Inspect ball bearings for smooth operation.
Replace rough or binding bearings.
(15) Install gasket (10) on inboard pump case (5).
(3)
Inspect seals for wear or damage. Replace
(16) Carefully push end cover (11) over rotor shaft
defective seals.
and seat against case (5); fasten with bolts (12).
f. Assembly.
(17) Rotate pump by hand to detect binding.
(1)
Press rotating seal assembly (6) in place on
(18) Install key (14) on pump shaft.
power rotor (15).
(19) Press coupling hub on pump shaft.
(2)
Place stationary seal assembly (8) on power
g Installation.
rotor as illustrated in figure 5-78. Lap in sealing faces of
(1)
Install coupling spider in hub on motor shaft.
carbon washer and floating seat. Wipe lapped sealing faces
(2)
Push pump into position on mounting to permit
perfectly clean and coat both faces with clean, light oil.
coupling hub on pump to engage hub and spider on motor
(3)
Install a snap ring (17) in slot adjacent to
shaft.
stationary seal (8).
(3)
Install pump mounting bolts, do not tighten.
(4)
Connect fuel lines to pump and tighten.
(5)
Tighten mounting bolts.
(6)
Check alignment of coupling (fig. 5-79).
5-106
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