MD Helicopters MD Explorer - Page 356

CSP−900RMM−2 MD Helicopters, Inc.
Rotorcraft Maintenance Manual
Page 214
Revision 34
12-00-00
Carefully adjust the hydraulic
pressure. Damage to the rotor
craft hydraulic system can occur.
(f). Set the pressure of hydraulic mule
(T2001) to 500 psig (3448 kPa)
maximum.
Do not make full or sudden
movements of the main rotor
flight controls with the external hydraulic
power applied to rotorcraft. The main rotor
flexbeams cannot accommodate full control
excursions (combinations of full collective
and full cyclic movements) without centrifu
gal force.
(g). Apply pressure to the rotorcraft
hydraulic system.
(h). Monitor the fluid level at sight gauge
(5) while cycling flight controls.
(i). After you get to the correct fluid
level, stop cycling the flight controls.
(j). Stop the pressure at hydraulic mule
(T2001).
(k). Stop hydraulic mule (T2001).
(4). Bleed the hydraulic system:
(a). Connect hydraulic mule (T2001)
return line to return port on the
same GSE panel to which the hy
draulic mule pressure line is con
nected.
(b). Apply 500 psig (3448 kPa) to the
hydraulic system with hydraulic
mule (T2001).
(c). Cycle all hydraulic actuators at least
15 cycles as you simultaneously
turn the main rotor head five times
minimum in the direction of normal
blade travel.
NOTE: During the bleed of the hydraulic sys
tem, make sure the hydraulic fluid (C112)
level does not go below the REFILL line of
the fluid level sight gauge on the manifold/
reservoir.
(d). Reduce the system pressure to 50
psig (345 kPa).
(e). Open manifold/reservoir bleed valve
(6).
(f). Examine hydraulic fluid (C112)
through the flex tubing at the BL
port.
(g). Let hydraulic fluid (C112) flow until
there are no air bubbles.
(h). Close bleed valve (6).
(i). Loosen the hose connections at the
pump pilot ports.
(j). Examine the discharge hydraulic
fluid (C112) for air bubbles.
(k). Let hydraulic fluid (C112) flow until
there are no air bubbles.
(l). Torque the hose connections.
(m). Stop the pressure from hydraulic
mule (T2001).
(n). Stop hydraulic mule (T2001).
(5). Disconnect hydraulic mule lines from
GSE panel.
(6). Install panel port covers.
(7). Remove flex tubing from manifold BL
port fitting and reconnect drain tube.
(8). Close access panels L155 and R155 (ref.
Section 06-00-00).
CAUTION
CAUTION