Piper Navajo PA-31 Service Manual page 47

PIPER NAVAJO SERVICE MANUAL
2-35. POWER PACK HYDRAULIC RESERVOIR.
2-36. SERVICING HYDRAULIC RESERVOIR. The hydraulic reservoir fluid level should be checked
every 50 hours and filled as necessary whenever the fluid level gauge shows low. Repairs and check
procedure for the powerpak may be found in Section VI of this manual.
a. Aircraft with filler assembly and brake system reservoir together may be checked by a dipstick
located through an access opening on the upper right side of the nose section.
b. On aircraft with separate systems, the powerpak has a transparent reservoir or sight gauge which
is reached by opening the forward baggage door and locating the powerpak in the center of the radio shelf
at the aft side of the baggage compartment.
2-37. FILLING HYDRAULIC RESERVOIR. On airplanes with serial numbers 31-1 to 31-299 the reservoir
is filled by using a brake bleeder or hydraulic test unit attached to the filler fitting located on the right forward
side of the power pack. The test unit may also be attached to the engine firewall fittings as described in Section
VI. The reservoir is full when fluid is visible through the sight gauge or when fluid flows from the overboard
vent line.
On airplanes with serial numbers 31-300 to 31-799 inclusive, the filler assembly is located on the upper
right side of the nose section. This filler assembly services both the hydraulic and brake systems. The amount of
fluid in the filler assembly is determined by a dipstick located in filler reservoir.
On airplanes with serial numbers 31-800 and up, a special filling/draining service hookup has been
installed just inside the right fuselage access panel of the nose section. A pressure pot or hydraulic test unit can
be connected to this installation by removing the access panel and the protective cap on the suction, fill and
drain fitting. Connect the fluid supply line from the supply source to the fitting. Then raise the lever to open the
valve and proceed to fill the reservoir To gravity fill the reservoir, support the supply container of hydraulic
fluid higher than the fluid level in the power pack reservoir. The reservoir is full when fluid is visible through
the sight gauge or when the fluid reaches the full line on the transparent type reservoirs. Be sure to close the
suction, fill and drain valve by placing the lever in the down position before disconnecting the supply line from
the fitting. Reinstall the protective cap on the fitting and install the access panel.
2-38. TIRES.
2-39. SERVICING TIRES. The tires should be maintained at the pressure specified in Table II-I. When
checking tire pressure, examine the tires for wear, cuts, bruises and slippage.
Reissued: 10/12/79
HANDLING AND SERVICING
1B23