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ULV System Boom Assembly Pressure Adjustment | Up
TM-5-3740-218-13P Pesticide Dispersal Unit Multicapabilty Helicopter Slung (PDU) Manual | Next
Figure 2-11. ULV System Operational Test |
TM 5-3740-218-1 3&P
Table 2-5. LV System Flow Rate -Water
Primary Hyd Pressure
Boom Pressure
D4-45 Nozzle Flow
300 psi
20 psi
8.5 gpm
450 psi
30 psi
10.5 gpm
500 psi
40 psi
12.2 gpm
675 psi
50 psi
13.6 gpm
(3) On hand control, make sure SYSTEM switch is set to OFF and POWER switch is ON. Make sure gate valve
is open.
(4) Place bucket under nozzle.
(5) Set key on engine to ON.
(6) Start engine with ENGINE START switch.
CAUTION
Note time before performing step (7) since application rate can only be determined if
dispersal time is known. During ground test, 30-minute operating time should not be
exceeded; overheating and damage to equipment will occur.
(7) Note time and set SYSTEM switch to ON. Check for hydraulic leaks, that EMPTY indicator is not lit, and
that pressure gage on secondary hydraulic manifold assembly indicates 300 psi.
(8) Press DISPERSAL pushbutton. After pre-determined time is up, release DISPERSAL pushbutton and set
SYSTEM switch to OFF.
(9) Measure amount of pesticide collected in bucket and calculate application rate (para 2-10, f). If application
rate is incorrect, proceed with step (10). If application rate is correct, proceed with step (12).
(10)
Loosen jam nut, adjust manifold pressure adjustment knob, then tighten jam nut.
(11)
Repeat steps (7) through (10) until application rate is correct.
CAUTION
Shut down hydraulic system immediately when EMPTY indicator lights, or damage to
pump could occur.
2-30
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