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Section V. FUEL PUMP, FUEL STRAINER AND FUEL TANK
Up
TM-55-4920-226-15 Test Stand Aircraft Hydraulic AHT-5A-1 Type D-5A Manual
Next
Figure 27. Camshaft and fuel pump mounting group, removal points
(6) Inspect all attaching hardware for dis-
(d) Remove the 3 screw and lockwasher
tortion and damaged threads. Replace
assemblies  (13)  that  secure  the
defective hardware.
valve plate (12) and gasket (11) to
the head and remove the valve plate,
e. Reassembly.
gasket, 2 valves (8), 2 springs (9),
(1) Fuel Pump Adapter.
and spring retainer (10).
(a) Install the primer spring (12, fig.
(e) T o remove the diaphragm (14),
27) and the packing ring (13) on
hold the linkage (21) up by press-
the fuel pump adapter (15).
ing down on the rocker arm (20).
(b) Insert the primer shaft (14) in the
Press down on the diaphragm and
adapter. Install the primer handle
disconnect the diaphragm from the
(11) in the shaft and secure with
linkage.  Remove the diaphragm,
the set screw in the shaft.
spring (16) and gasket (15) from
(2) Fuel Pump.
the mounting bracket (22).
(a) Assemble the rocker arm (20, fig.
(f) Compress and disengage the spring
28) and the linkage (21). Insert
(17) from the rocker arm (20) and
the bushing (19) in the alined holes
the mounting bracket.
of the arm and linkage.
(g) Drive the headless straight pin (18)
(b) Position the arm and linkage in the
out of the mounting bracket. Re-
mounting bracket (22) and drive
move and separate the rocker arm
the headless straight pin (18) into
(20), linkage (21), and the bushing
the alined holes of the bracket and
(19).
bushing.
(2) Fuel Pump Adapter.
(c) Install the spring (17) between the
(a) Remove the setscrew that secures
bosses of the rocker arm and the
the primer handle (11, fig. 27) in
mounting bracket.
the primer shaft (14) and remove
the handle and shaft from the fuel
(d) Position a new gasket (15), spring
pump adapter (15).
(16) and a new diaphragm (14) on
(b) Remove the packing ring (13) and
the mounting bracket (22). Hold
p r i m e r spring  ( 1 2 ) f r o m t h e
the rocker arm (20) down and de-
adapter.
press the diaphragm to engage it
with the hook end of the linkage
d. Cleaning, Inspection, and Repair.
(21).
(1) Clean all metal parts in an approved
(e) Install the spring retainer (10), 2
cleaning solvent and dry thoroughly.
springs (9), 2 valves (8), gasket
Clear all fuel passages with com-
(11), and valve plate (12) on the
pressed air.
fuel head (7) and secure the valve
(2) Inspect the valve plate, dome, pump
plate with 3 screw and lockwasher
head, mouting bracket, and fuel pump
assemblies (13).
adapter for cracks, breaks, distortion,
(f) Position the fuel head on the dia-
and damaged threads. Replace defec-
phragm (14) and mounting bracket
tive parts.
( 2 2 ) in accordance with match
(3) I n s p e c t the rocker arm, linkage,
m a r k s made during disassembly
primer shaft, and primer handle for
and secure with the six screw and
cracks, breaks, and excessive wear.
lockwasher assemblies (6).
Replace all defective parts.
(g) Place the fuel filter (5), a new gas-
(4) Inspect the fuel filter for clogged or
ket (4), and the pulsator dome (3)
torn condition. Replace a defective
on the fuel head and secure with
filter.
the gasket (2) and bolt (1).
(5) Inspect the springs for cracks, distor-
f. Installation.
tion and lack of tension. Replace a
(1) Install the plunger cap (17, fig. 27)
defective spring.
63
AGO 5742A

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