SkyTrak 6036 Service Manual - Manual (Page 224)

Section 9 Hydraulic System
9-74 Model 6036/6036T S/N 9B0500 thru 14833
SUPPLY PORT
RETURN PORT
EXT. RAISE
EXT.
RETR.
RAISE
LOWER
RETR. LOWER
Cleaning and Drying
Clean all metal parts in an approved cleaning
solvent such as trichlorethylene and blow dry.
Immerse metal parts in hydraulic oil if they are to
be exposed to air for more than 4 hours.
Inspection
1. Inspect spool seating surfaces. Surfaces
should be sharp and clean, and free of nicks
or excessive wear. Replace entire section if
worn or damaged.
2. Replace all O-rings and backup rings with new
ones. Repair kits are available.
3. Inspect all plugs for stripped or damaged
threads. Replace if damaged.
4. Inspect filter for damage and replace if neces-
sary.
2
3
6
7,
8
9
1
7, 8
4 5
10, 11
12
13
1. Branch Tee
2. Tube Reducer
3. Tube Assembly
4. Relief Valve
5. Elbow
6. Connector
7. Reducer
8. Run Tee
9. Connector
10. Reducer
11. Run Tee
12. Tube Reducer
13. Connector
MK0210
c. Disassembly of the Inlet Section
1. Remove the plug (1, Fig. 9.45), filter (2) and
O-ring (3). Discard filter and O-ring. Replace
with kit at assembly.
2. To remove the pilot reducing spool (4),
remove plug (5), pilot shims (6), spring (7),
spring guide (8) and ball (9). Pull spool
straight out of cavity.
Note the number of shims (6) used.
3. Remove plug (10) and pull bypass spool (11)
from cavity.
4. Loosen locknut (12) and unscrew seat and
adjustment plug (13 & 14) from inlet valve
section (15). Remove spring (16), washer
(17), O-rings (18 & 19) and backup ring (20).
Discard O-rings and backup rings.
5. Using an Allen wrench, remove plug (21) and
setscrew (22). Shake spring (23) and cone
(24) from the plug cavity.
6. If necessary, remove plugs (25 & 26) and
orifice screw (27).
Assembly
NOTE: Parts kits are available for all sections of
the valve. Have the proper kits on hand before
starting the assembly procedure. Refer to the
Parts Manual for kit part numbers.
1. Slide cone (24, Fig. 9.45) and spring (23) into
plug cavity. Install setscrew (22) and plug
(21). DO NOT bottom out the setscrew. This
may damage the cone and create a severe
over-pressure situation when the valve is put
back into service.
2. Install new O-rings (18 & 19) and new backup
ring (20) on adjustment plug and seat (13 &
14). Assemble locknut (12) to plug. Install
compression spring (16) and spring washer
(17) on adjustment plug. Carefully slide
adjustment plug assembly into the cavity.
3. Coat the bypass spool with a thin layer of
hydraulic oil. Install bypass spool (11) and
plug (10) with new O-ring into inlet section.
4. Install pilot reducing spool (4), valve ball (9),
spring guide (8), spring (7), pilot shims (6) and
plug (5), with new O-ring into cavity of valve.
Check that plug is properly seated.
NOTE: The number of shims (6, Fig. 9.45)
installed should be the same as removed unless
shims must be added or removed to adjust pilot
pressure. Refer to paragraph 5.9.5.a.
5. Replace O-ring (3) on filter (2) and slide into
section cavity. Install plug (1) with new O-ring.
6. Replace plugs (25 & 26) and orifice screw
(27), if removed.
Fig. 9.43 Control Valve Hydraulic Fittings