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 TM 55-1905-217-34
oil. Then, start the locating screw slot end of the selector valve straight into the control valve housing with the locating
screw (19, fig. 3-36) hole in the right-hand side of the housing. Continue to slide the selector valve in the housing until the
slot in the valve is in line with the locating screw hole.
(b) Place the copper washer over the end of the selector valve locating screw (19). Then, install the screw in the
control valve housing with the end of the screw registering with the slot in the selector valve. Tighten the screw to 13-17 ft-
lb torque.
(c) Support the control valve housing in a vertical position with the lever end of the selector valve facing up.
(d) Apply a thin coat of sealing compound to the outside diameter of the oil seal (2).
(e) Place the selector valve oil seal (2) over the end of the selector valve with the lip of the oil seal facing the
housing. Then, start the oil seal straight into the control valve housing.
CAUTION
Care should be used not to damage the lip when installing the oil seal over the end
and shoulder of the selector valve.
(f) Place a small wood block, 1 1/2 inches thick, with a 7/8 inch hole drilled through its center, over the end of the
selector valve and against the oil seal. Then, tap the oil seal straight into the housing until it is flush with the outside face of
the housing.
(3) If removed, apply a thin coat of sealing compound to the outside diameter of the control valve housing plug
(17). Then, place the plug in the opening in the end of the housing with the convex side of the plug facing out. Place a 1/2
inch diameter drift against the center of the plug; then, tap the drift with a hammer and securing the plug in the housing.
(4) Lubricate the selector valve poppet (25) with engine oil. Place the pointed end of the poppet in the hole in the
bottom side of the housing. Then, insert the poppet spring inside the poppet and secure in place with plug. Tighten the
poppet plug to 107-117 ft-lb torque.
(5) Aline the oil passages in each shutoff valve with the oil passages in the top of the control valve housing. Then,
place a shutoff valve lever on each shutoff valve with the arm of the lever pointing straight up. Secure each lever with a
bolt, lock washer and nut. Tighten the bolt nut to 8-10 ft-lb torque.
(6) Operate each shutoff valve to check for ease of operation. Also, check the alinement of the oil passages when
the levers are positioned straight up.
(7) Rotate the selector valve to the neutral position-midway between the forward and reverse positions-then, place
the selector valve lever over the end of the selector valve with the arm of the lever pointing straight up. Tighten the lever
attaching bolt to 7-9 ft-lb torque.
(8) Install the covers and gaskets over the oil passage openings in the sides and top of the control valve housing
that are not being used. Tighten the 1/4 inch-20 cover bolts to 7-9 ft-lb torque, and 5/16 inch-18 cover bolts to 13-17 ft-lb
torque.
e. Installation.
(1) Affix a new gasket to the bottom side of the control valve housing. Then, place the control valve assembly over
the opening in the top of the reduction gear housing cover with the bolt holes in alinement, and the lever attaching end of
the selector valve facing the control side of the unit.
(2) Install the four bolts, lockwasher and plain washers securing the control valve housing to the reduction gear
housing cover. Tighten the bolts to 35-39 ft-lb torque.
(3) Connect the two oil cooler to control valve oil tubes to the back of the control valve housing.
(4) Affix a new gasket to the control valve end and a new gasket to the reverse gear housing end of each oil tube
assembly.
(5) Attach the end of the tube to the control valve housing with four 1/4 inch-20 x 7/8 inch bolts and copper
washers. Attach the opposite end of the oil tube to the reverse gear housing with four 5/6 inch-18 x 1 inch bolts and
lockwashers. Tighten the 1/4 inch-20 bolts to 7-9 ft-lb torque and the 5/16 inch -18 to 13-17 ft-lb torque.
(6) Attach operating linkage to the control valve lever.
3-11. Transmission Oil Pump
a. Removal. Remove the transmission oil pump (TM 55-1905-217-12, para 4-70).
b. Disassembly.
(1) Clamp the flange of the pump body in a bench vise.
(2) Remove the tachometer drive and adapter assembly from the pump.
(3) Refer to figure 3-39 and disassemble the oil pump.
3-55
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