8
B. Reassembly
Before reassembly of the servo valve, coat all parts with
hydraulic fluid and replace all seals and gasket.
For proper reassembly, an alignment tool (Figure 5) must be
used. This tool can be procured from any Vickers branch. It
is the only special tool required.
C. Spool Centering
Assemble sleeve sub-assembly (36) flush with body (37) at
the adapter end (13), then, assemble torque motor so hole
which normally receives the threaded end of the pilot spool is
aligned with the threaded end of the alignment tool.
NOTE
Alignment tool must be clean before using.
Tighten down the torque motor and remove the alignment
tool. Assemble the pilot spool to the torque motor. Install the
valve on the system and adjust the pilot spool for center at
the torque motor armature nut with a 3/64 Allen wrench.
Replace the cover and trim if necessary as outlined in null
adjustment paragraph, page 7.
Reassembly is in reverse order of disassembly. Follow index
numbers of Figure 6 in reverse order.
Model Number
Torque
lbf. in.
SA4-03-**–**–10, 11, 12
SA4-03-**–**–13, 14, 15
SA4-06-**–**–10, 11
SA4-06-**–**–12, 13
35 – 40
80 – 85
35 – 40
80 – 85
Table 1. Mounting Bolt Torque
D. Product Life
The longevity of these products is dependent upon
environment, duty cycle, operating parameters and system
cleanliness. Since these parameters vary from application to
application, the ultimate user must determine and establish
the periodic maintenance required to maximize life and
detect potential component failure.
Figure 5. Alignment Tool (938710)
.2497
1.00
8.37
.37
2.37
.125 Dia.
+.0000
–.0002 Dia.
Heavy Knurl
.112 Dia. for
#4-48 Thd.
Drill Rod
Hardened and Ground
Rock “C” 50-54
