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 TM 55-1905-217-34
(7) The valve spring has a free length of 1.97 inches and requires a load of 7.3 .2 lbs. to compress it
to a length of 1.18 inches when new. If the spring falls below the above specifications, replace the spring.
(8) A fuel pump overhaul kit which contains oil seals, gaskets, shaft and gear assemblies, and relief
valve parts is available for service.
d. Reassembly. Reassemble the fuel pump as follows:
(1) Lubricate the lips of the oil seals with a light coat of vegetable shortening, then install the
oil seals in the pump body as follows:
(a) Place the inner oil seal on the pilot of the installer handle J 1508 so that the lip of seal will face in
the same direction as the original seal which was removed.
(b) With the pump body supported on wood blocks, insert the oil seal and tool in th pump body and
e
drive the seal in until it bottoms.
(c) Place the shorter end of adapter J 1508-9 over the pilot and against the shoulder of the installer
handle. Place the outer oil seal on the pilot of the installer handle with the lip of the seal facing the adapter.
Then, insert the pilot of the installer handle into the pump body and drive the seal in until the shoulder of the
adapter contacts the pump body. Thus the oil seals will be positioned so that the space between them will
correspond with the drain holes located in the bottom of the pump body.
(2) Clamp the pump body in the soft jaws of a bench vise with the valve cavity up. Lubricate the outside
diameter of the valve and place the valve in the cavity with the hollow end up. Insert the spring inside of the
valve and the pin inside of the spring. With a new gasket in place next to the head of the valve plug, place the
plug over the spring and thread it into the pump body. Tighten the plug.
(3) Install the fuel pump drive gear over the end of the drive shaft which is not squared (so the slot in the
gear will face the plain end of the shaft when installed). This operation is very important, otherwise fine score
marks caused by pressing the gear into position from the square end of the shaft may cause rapid wear of the
oil seals. Press the gear beyond the gear retaining ball detent. Then, place the ball in the detent and press the
gear back until the end of the slot contacts the ball.
(4) Lubricate the pump shaft and insert the square end of the shaft into the opening at the gear side of
the pump body and through the oil seals.
(5) Place the driven shaft and gear assembly in the pump body.
CAUTION
The driven gear must be centered on the shaft to give proper end clearance.
Also, the chamfered end of the gear teeth of the production gear must face
the pump body. If a service replacement gear with slot is used, the slot must
face toward the pump cover.
(6) Lubricate the gears and shafts with clean engine oil.
(7) Apply a thin coating of sealant on the face of the pump cover outside of the gear pocket area. Then,
place the cover against the pump body with two dowel pins in the cover entering holes in the pump body. The
cover can be in- stalled in only one position over the two shafts.
CAUTION
The coating of sealant must be extremely thin since the pump clearances
have been set up on the basis of metal-to-metal contact. Too much sealant
could increase the clearances and affect the efficiency of the pump. Use
care that sealant is not squeezed into the gear compartment, otherwise
damage to the gears and shafts may result.
(8) Secure the cover in place with eight bolts and lock washers, tightening the bolts alternately and
evenly.
(9) After assembly, rotate the pump shaft by hand to make certain that the parts rotate freely. When the
shaft does not rotate freely, attempt to free it by tapping a corner of the pump.
e. Installation. Refer to TM 55-1905-217-12, paragraph 4-29, for installation of the fuel pump.
3-4. Governor and Throttle Controls
a. Removal. Refer to Operator and Organization Maintenance Manual TM 55-1905 217-12, paragraphs 4-
30 and 4-32.
b. Disassembly.
(1) Governor cover:
(a) Remove the plug from the throttle shaft (8, fig. 3-25).
3-28
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