Uppercarriage; Check Pressure Accumulator - Manitowoc GHC75 Maintenance Instructions Manual

Crane Care
6

Uppercarriage

6.1 Check pressure accumulator

Personnel
Service Technician
Service Technician (company specialist)
21.12.2017
Interval
Annually / every 2000 OH
Once every 250 OH / approx. 4-6 weeks after commissioning
The preload pressure is checked using the pressure accumulator
of the pilot control circuit pressure accumulator.
Special tool:
n
Lower the attached loads to the ground.
1.
Secure the machine against being restarted without authori-
2.
zation.
Open the left service door.
3.
Connect the manometer to the storage fill-valve of the pilot
4.
control circuit pressure accumulator.
5. Switch off the engine and return ignition key immediately to
position l.
Move both control levers in the operator cab in all directions
6.
several times.
Observe the pressure gauge.
7.
The value displayed just prior to the pressure drop corre-
sponds to the preload pressure of the pressure accumulator.
ð As soon as the preload pressure is reached, the valve in
the pressure accumulator closes. The pressure gage
pointer drops suddenly to 0.
Compare the indicated value with the tolerances for the pres-
8.
sure accumulator.
ð If the preload pressure is outside tolerance, replace the
pressure accumulator or have it refilled with nitrogen.
Remove the pressure gauge.
9.
Every 10 years/20,000 operating hours, arrange for a pressure test
and an internal inspection of the pressure accumulator by a spe-
cialist.
Preliminary
GHC75 Telescopic crane
Uppercarriage
Check pressure accumulator
Manometer
57