11
Section VII – Test Procedure
A. Test Conditions
Hydraulic
Fluid Medium:
Oil viscosity grades: 150–315 SUS
(32–68 cSt) @100
F (38
C)
Running: 70–250 SUS (13–54 cSt).
At start–up: 1000 SUS (220 cSt).
Maximum
Fluid Temperature: 115
–125
F
Flow Range:
FCGT-02-A-11 5 – 250 cu. in. / min.
FCGT-02-B-11 50 – 1000 cu. in. / min.
Operating Pressure: 3000 PSI
(Maximum)
Reverse Free Flow: 1400 cu. in. / min.
(Maximum)
Differential Operating Pressure: 150 PSI
Power Supply (Recommended for two 40 Ohm coils
connected parallel). See installation drawing 521555:
EMCS–P–30 Assembly 631995
Hysteresis (With recommended power supply):
4% of max. current without dither.
2% of max. current with 45 mA (rms) dither.
Dither (optimum performance):
45 mA (rms) @ 60 Hz.
Subplate: FGTM–02–10 (Assy. 251168)
Bolt Kit:
BKFCGT–02–644 (Bolts must be grade 7
or better).
Standard Graphic Symbol for Fluid Power Diagrams
Normal flow
Reverse flow
B. Test
NOTE
A sample hydraulic circuit is shown in Figure 6.
Modify an existing test stand or obtain the
necessary components to assemble the test circuit.
1. Connect subplate FGTM-02-10 (Assembly 251168) to
the test stand and mount the FCGT-02 with bolt kit
BKFCGT-02-644.
2. Refer to sample test circuit Figure 6 during the follow-
ing steps:
a. Close globe valves (6) and (15).
b. Open globe valves (1) and (12). (Vent to facilitate
priming and load relief valve (11).
c. Energize hydraulic system. After system has
primed, alternately adjust test relief valve (2) while closing
globe valve (1) until 3000 PSI is read on gage (5) and globe
valve (1) is completely closed.
d. Open globe valve (6).
NOTE
Valve may be unstable until all air is purged from
the system. Allow at least one minute for valve to
stablize before adjusting the metering spool.
e. Adjust metering spool (12 Figure 3) for zero flow.
Use a 0.05 inch hex key.
f. Open globe valve (15) and adjust metering spool
(12) to the minimum flow condition noted in Table 6. Use a
beaker to measure the minimum flow.
Model
Minimum flow
FCGT-02-A-***-11
5 cu. in. / min.
(81.9 cu. cm. / min.)
FCGT-02-B-***-11
50 cu. in. / min.
(819.35 cu. cm. / min.)
Table 6. Minimum Flow Adjustment.
3. Turn off hydraulics and remove valve from the test
stand. Place on the work bench with torque motor (10) up.
Slightly loosen screws (8) that hold torque motor (10).
4. Connect power supply (9, figure 6) to valve. Observe
polarity shown in figure 5. If millimeter reads in reverse, re-
verse its connections.
5. Set dither control high enough to feel a vibration at
the torque motor armature. position the torque motor for
maximum dither as felt at the torque motor armature nut,
then tighten the torque motor mounting screws to 30 lb. in.
Dither must still be felt at the torque motor armature.
6. Apply full signal (300 mA for two 40 Ohm coils in
parallel) to the torque motor and return to zero current.
Dither must be felt throughout the entire cycle. If dither
fades, repeat steps (5) and (6).
Refer to Figure 5 for correct full signal current if coils are
other than noted.
7. Recalibrate minimum flow, perform steps (1) and (2).
8. Install cover (7). Secure with screws (8) and lock-
washers (9). Check valve performance with power supply.
Remove valve from the test stand.
