Hydraulic System - Oil & Filter - Greenlee Fairmont HG3505A Instruction Manual

Maintenance (cont'd)
Hydraulic System - Oil and Filter
Do not disconnect tool, hoses, or fittings while
the power unit is running or if the hydraulic fluid
is hot. Exposure to hot hydraulic fluid can cause
serious burns.
Perform this procedure in a clean environment.
Cleanliness is vital to maintain the service life of the
unit. Refer to Exploded View, HG3505A Power Unit.
1. Engine must be shut off, and red bypass valve on
reservoir pulled up. Disconnect hoses and tool from
the unit.
2. Place a pan under pipe plug (41) to catch oil as it
drains. The capacity of the hydraulic reservoir is 0.9
gallons (3.4 liters). Remove pipe plug, and allow the
system to drain.
Note: The hydraulic filter should be cleaned when
the system is drained. In order to clean the filter,
the reservoir must be removed. Cleanliness is
especially important when this procedure is
done.
3. Remove cap nuts (40) and washers (39). Pull
reservoir (38) off of unit. Spacers (37) may fall free.
4. Clean out any dirt which has accumulated in the
bottom of the reservoir.
5. Remove filter (20), screwing it out of pump inlet
port. Inspect O-ring (21) for signs of cracks, wear
or damage. Clean filter with solvent, and dry with
compressed air. If filter is damaged, replace it.
6. Reinstall filter. Check O-ring (34) for cracks, wear,
or damage. Install spacers (37) and reservoir,
secure with cap nuts (40) and washers (39).
Replace pipe plug (41).
7. Remove breather/filler plug (22), clean filter in
breather/filler plug with solvent, and dry with com-
pressed air. Fill reservoir with new, clean oil. See
Specifications. Do not use oil which was drained
from reservoir or recycled oil. Replace breather/filler
plug.
Note: New hoses must be prefilled with hydraulic oil.
See Hose/Tool Connections.
Greenlee Textron / Subsidiary of Textron Inc.
HG3505A / 42303 Portable Power Unit
12 4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070