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 CAUTION
6-188.
ADJUSTMENT. Adjust valve as follows:
Do not use wire or metallic rod or pick to clean
(1) Connect pressure part of control valve to
fluid passages since such procedure could
a hydraulic test pressure source of 2,000 psig with a flow
result in irreparable damage to parts.
rate of 4 gallons per minute (or greater).
(2) Connect hydraulic test source return hose
6-185.INSPECTION.
Inspect control valve parts as
to return port on control valve and temporarily plug
follows.
unused ports in valve body.
(3) Raise either plunger and note test
(1) Inspect valve body for cracks and for
pressure. If test pressure is not within the range of
scoring or other damage to plunger bores.
1,600 to 1,700 psig, turn adjusting setscrew clockwise to
(2) Inspect threaded parts and tapped holes
increase pressure or counterclockwise to decrease
for stripping or other damage to threads.
pressure.
(3) Carefully inspect plungers for surface
(4) When relief valve pressure is properly set,
defects such as scoring, pitting or excessive wear.
tighten jam nut on adjusting setscrew and install relief
(4) Inspect poppet and bearing for wear and
valve nut over end of setscrew.
scoring.
(5) Disconnect control valve from test
pressure source and remove temporary plugs.
6-180.
REPAIR. Repair control valve parts as follows:
(1) Replace all parts found to be defective
6-189.
TILT CYLINDER.
during disassembly and Inspection.
NOTE
6-190.
DISASSEMBLY. Proceed as follows:
(1) Remove rod end (1, figure 7-17) secured
If either of tie plungers or the valve body is
with nut (4), screw (2) and washer (3).
defective to extent of being unserviceable,
(2) Remove packing retainer (5) attached
replace entire control valve assembly.
with two screws (6) and washers (7). Remove wiper ring
(2) Repair minor thread damage with tap or
(8) from inside packing retainer.
thread chaser.
(3) Unscrew stuffing box (9) and remove
(3) Remove minor surface defects from parts
packing set (I1), packing (12), ring (13) spacer (14) and
with crocus cloth (Specification P-C458).
rings (15 and 16) from stuffing box.
(4) Replace all packings with new parts at
(4) Pull piston and rod assembly (17) from
each reassembly.
cylinder (18). Remove ring (15) from piston and rod
assembly.
6-187. ASSEMBLY. Reassemble control valve as
follows:
6-191. CLEANING. Cleaning disassembled parts of
(1) Install packings for plungers in valve body
tilt cylinder as follows:
bores; then, insert plungers.
(1) Wash metallic parts in SD and dry with
(2) Place washers on ends of plungers.
compressed air under moderate pressure or with clean
Then, install springs using spring retainer and screws.
cloth.
(3) Screw plugs to which gaskets have been
(2) Be sure to clean parts thoroughly to
applied into valve body to cover springs and tighten
facilitate inspection.
securely.
(4) Insert bearing into valve body and screw
6-192. INSPECTION. Inspect tilt cylinder parts as
associated plug into valve body.
follows:
(5) Place packing in groove of poppet and
(1) Inspect all threaded and tapped parts for
insert poppet into bearing. Place spring on poppet and
stripped threads or other thread damage.
spring seat on spring.
(2) Inspect packing retainer, stuffing box,
(6) Screw relief valve plug into valve body
piston and rod, and cylinder for cracks and distortion.
and screw adjusting setscrew into relief valve plug.
(3) Inspect bore in cylinder for scratches,
Install jam nut on adjusting setscrew but leave loose.
scoring, pitting and other surface defects.
(7) Install remaining plugs in valve body.
6-44
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