Lull 1044C-54 Series II Service Manual - Manual (Page 358)

Axles and Brakes
9-14 31200079
Precautions
WARNING: Never fill an accumulator with oxygen! An explosion could
result if oil and oxygen mix under pressure. Always fill an
accumulator with dry nitrogen. Nitrogen gas is free of water
vapor and oxygen which makes it harmless to parts and is
safe to use.
CAUTION: Never fill an accumulator with air. When air is compressed,
water vapor condenses and can cause corrosion. This may
damage seals and ruin the accumulator.
CAUTION: Never charge an accumulator to a pressure more than that
specified. Pressure should be 375–425 psi.
WARNING: Always release all hydraulic pressure before removing an
accumulator from the system.
CAUTION: Before disassembling an accumulator, release both gas and
hydraulic pressure. When disassembling an accumulator,
make sure that dirt and abrasive materials do not enter any
openings.
Pre-Charging Accumulator
Note: Replacement accumulators shipped from the factory are not pre-charged.
Make sure the nitrogen bottle, as well as the charging and gauging
assembly used, is compatible with the gas valve assembly. The nitrogen
source and all components must be rated for a pressure at least as high as
the nitrogen source. It is strongly recommended that the nitrogen bottle
has a high pressure regulator. Nitrogen gas bottles for water-pumped
nitrogen have right-hand valve threads and are used with accumulators up
to 3000 psi.