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 TM 55-1905-217-34
ME 1905-217-34/4-55
Figure 4-55. Ramp locking system two-way selector valve, exploded view (hulls 8540-8560 and 8580-8618).
(1) Remove snap rings at knob end and rear end of spool.
(2) Push knob in until rear seal is exposed, remove the rear seal.
(3) Spool may be now removed from the valve housing. Front seal from spool.
d. Cleaning, Inspection, and Repair.
(1) Discard oil seals. Wash parts in solvent, (FED. SPEC. PD-680), type I, and place them on a clean
surface for inspection.
(2) Inspect the valve spools and housing bore for burrs and scoring.
(3) Carefully remove burrs by light stoning or lapping.
(4) If scoring appears to be excessive, replace the spool and housing.
e. Reassembly.
(1) To prevent cutting seal on sharp edges, wrap spool in three or four layers of glossy paper, leaving
only the front seal groove exposed. Install new seal from rear end of spool over the paper and into the front
seal groove.
(2) Apply clean hydraulic fluid to a new seal. Remove paper and insert spool in body and with a rotating
action on knob, push the spool in until the front seal disappears and until the rear seal groove is exposed.
(3) Install rear seal in groove.
(4) Apply clean hydraulic fluid to rear seal.
(5) Install rear snap ring and with firm rotating action pull spool to stop.
(6) Install front snap ring.
f. Installation. Install the two-way selector valve (TM 55-1905-217-12, para 4-98).
4-86
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