6-71. HOIST MANIFOLD BLOCK - Continued
b. Cleaning and Inspection.
Dry cleaning solvent P-D-680 is potentially dangerous. Avoid
repeated and prolonged breathing of vapors and skin contact
with the liquid. Do not use near open flame, arcing equipment
or other ignition sources. Always wear eye protection and
protective clothing. The flash point of P-D-680 is 100 to 138
deg. F (38 to 59 deg. C).
(1) Clean all parts in dry cleaning solvent (Item 3, Appendix E).
Death or serious injury could occur if compressed air is directed
against the skin. Do not Use compressed air for cleaning or
drying unless the pressure is/has been reduced to 30 psi (2.11
kg/cm ) or less. When working with compressed air, always use
chip guards, eye protection and other personal protective
(2) Dry all parts with compressed air.
If any adjustable valves (6, 10, and 11) are damaged entire hoist
manifold block assembly must be replaced. It is adjusted as a
complete assembly on a special test stand by the manufacturer.
(3) Visually inspect threads of parts removed for damage. Replace solenoid valve (1), plugs (2, 8, and
12), adapters (3, 5, and 7), check valves (4), needle valve (9), fittings (13) and restrictor pipe plug (14)
H damaged threads. If pressure reducing valve (6), any of three flow control valves (10), or either of
two pressure compensators (11) have damaged threads, entire hoist manifold block assembly must be
(4) Visually inspect all tapped holes and O-ring seal counterbores in manifold block (15). Replace
entire hoist manifold block assembly if damaged.
(5) Check that passages in manifold block (15) are not blocked as detailed in para 4-9.