5 Operation
14
Pay attention to possible faults
Read the instructions carefully
Step 1
Long Term Storage
If the Alfa Laval GJ A2
has not been used for over a month, it may be reluctant to initially start because of the natural “set”
that occurs with the dynamic parts. To remedy this, loosen the Collar Set Screw (60), remove the Collar (3), and lift out the
Stator (4). Using something thin, such as a small hex key or a paper clip, manually rotate the Rotor (5) in the clockwise
direction for 20 to 30 revolutions. The (5) should become progressively easier to rotate as you spin it. If so, reassemble the
unit and attempt to operate it.
Step 2
Debris Inside
Loosen the Collar Set Screw (60), remove the Collar (3), and lift out the Stator (4). Look for and remove any debris caught in
the (4) and the vanes of the Rotor (5). Remove any material wound around the Input Shaft (9). In addition, check for any
debris caught in the outlet holes of the Stem (38), the nose of the Tee Housing (39), and the Nozzle Housing (40).
Step 3
Insufficient Flow
The Alfa Laval GJ A2 was configured to meet certain operating conditions outlined at the time of the initial sale, such as flow
rate (m
3
/hr / gpm), pressure (bar / psi), temperature, chemical content of the wash fluid, cycle time, etc. If the Nozzle (42) size
is too small and/or the opening at the bottom of the Stator (4) is too large, the Tee Housing (39) will not turn.
Look for restrictions in the fluid supply such as a clogged filter, kinked hose, or deposits in the piping.
Step 4
Tight Clearances
A recently overhauled Alfa Laval GJ A2 may fail to operate when first returned to service. If the machine seems otherwise
fine, try running it with the Nozzle Housing (40) removed. The reduction in pressure and additional flow will invariably be
enough to overcome the extra resistance of new Bearings and Seals. Twenty minutes of operation should loosen the machine
to run normally with the (40) reinstalled.
5.3 Cleaning Solution Leakage
- Worn Bearings
Some leakage from the Tee Housing / Stem (39 / 38) and Tee Housing / Nozzle Housing (39 / 40) joints is normal. If the
flow rate has noticeably increased, or, the pressure decreased, check the condition of the Tee and Nozzle Housing
Bearings, (54) and (53), (48), and (49), respectively. Specifically, examine the condition of the external and internal O-
rings.
- Worn Housing
Inspect the internal bores of the Nozzle and Tee Housings (40) and (39) for excessive wear (grooved or scored).
Replace any that show distinct grooves.
- Worn Drive Body O-rings
Although some leakage from components positioned inside of the tank is normal, it is not for components that make up the
external Planetary Geartrain (drawing 8).
Leakage between the Collar (3) and Cap (2) may indicate worn or damaged Collar O-rings (26) and (27). Remove the (3)
and inspect the (26) and (27) for signs of damage or wear.
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