Lull 944E-42 Service Manual - Manual (Page 461)

8.209 Model 644E-42/944E-42 Rev. 6/04
Hydraulic System
13. Let the pre-charge on the accumulator set for 10-15
minutes. This will allow the gas temperature to
stabilize. If the desired pre-charge range is
exceeded, turn the “T” handle (4) all the way in. With
the main valve (7) closed on the nitrogen bottle, turn
the gas valve/bleed valve (6) out to bleed pressure
off the accumulator. Turn the valve all the way in and
check the pressure reading on the regulator gauge.
14. When the correct pressure is reached, back the “T”
handle (4) on the accumulator fill kit all the way out
(counter-clockwise). Bleed the pressure from the
hose by turning the gas valve/bleed valve out to
relieve the pressure.
15. Turn the gas valve/bleed valve (6) all the way in and
remove the schrader adapter (5) from the valve on
the accumulator.
16. Reassemble the protective cap onto the gas valve
on the accumulator.
8.13.3 Checking Pre-Charge
a. Gas Leaks
1. If an external leak is suspected, apply soapy water to
the gas valve (9) and the seams of the gas
bottle (10). If bubbles form, the accumulator has to
be replaced.
2. If an internal leak is suspected, check for foaming oil
in the hydraulic oil reservoir and/or no accumulator
action. If any of these signs are evident, the
accumulator has to be replaced.
MU1980
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MU1970
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