Hydraulic System; Hydraulic Hose Lines; Bleed Hydraulic Pumps - Manitowoc GHC75 Maintenance Instructions Manual

Hydraulic system

Bleed hydraulic pumps

10 Hydraulic system
10.1

Hydraulic hose lines

Storage and service life
Check
Defects
10.2 Bleed hydraulic pumps
90
Even with proper storage and use at permissible loads, hoses and
hose lines are subject to natural aging. This means that their
service life is limited.
The owner is responsible for ensuring that hose lines are replaced
at suitable intervals, even if safety defects cannot be detected on
the hose line.
Hose lines must be replaced at least every six years, including a
possible storage period of two years, maximum.
Hose lines should be inspected by an expert at least once a year to
ensure that they are safe for further use.
Repair any defects detected immediately.
Replace hose lines in the following cases:
Outer layer damaged as far as reinforcement (e.g. abrasion
n
points, cuts, cracks);
Outer layer is brittle (cracks appearing in hose material);
n
Deformation, which does not conform to the natural shape of
n
the hose or hose line, both when under and not under pres-
sure, or when bent (e.g. layer separation, bubbles forming);
Leaks.
n
Damaged or deformed hose fittings (sealing function impaired);
n
Hose has separated from fittings.
n
Corrosion of fittings that reduces function and strength;
n
Failure to observe Installation requirements;
n
Storage times and/or service life exceeded.
n
Protective equipment:
Special tool:
Park the machine on secure, even ground.
1.
2. Secure the machine against being restarted without authori-
zation.
3. Depressurize the hydraulic system.
F Section Depressurizing the hydraulic system.
Open the service flap.
4.
Preliminary
GHC75 Telescopic crane
Safety shoes
n
Hygiene protection gloves
n
Protective clothing
n
Allen key, width 12 mm
n
Lint-free cleaning cloth
n
Crane Care
21.12.2017