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5.1.2 Flowmeter Troubleshooting:
Example Readings:
Use DIAG 19 (above) and the following information to determine the usability of the
pistol under specific flowmeter conditions:
Note (a)
This type of reading, with both floats equally high and pressures correct, can be due to:
Oversize nozzle holes or oversized air nipple or too little air pressure.
Mixing Block holes too large (This mainly with Fine Spray Nozzle Systems).
Pressure Gauges reading too low.
In all cases, the pistol will be quite usable if the flowmeter readings are within 15% of
recommended readings. Spray throughput may be increased.
PROBLEM
POSSIBLE CAUSES
REMEDY
OXYGEN FLOAT - NORMAL
GAS FLOAT - LOW
Restriction in Nozzle
Gas hole in Mixing Block
restricted
Clean Nozzle with special
Metallisation cleaners
Clear or replace Mixing Block
OXYGEN FLOAT - HIGH
GAS FLOAT - LOW
Middle ‘O’ Ring at rear of
Mixing Block missing /
damaged
Replace ‘O’ Ring
OXYGEN FLOAT - LOW
GAS FLOAT - LOW
Outer ‘O’ Ring at rear of
Mixing Block missing /
damaged
Replace ‘O’ Ring
OYGEN FLOAT - LOW
GAS FLOAT - HIGH
Restriction in Mixing Block
oxygen holes missing /
damaged
Clear or replace Mixing Block
Note (a)
CORRECT
Note (b)
CORRECT
Note (c)
INCORRECT
DIAG 19
Summary of Contents for MK 73
Page 1: ...Page 1 of 64 ssue 21 11 11 ...
Page 43: ...Page 43 of 64 SECTION 5 FAULT FINDING 5 1 Troubleshooting 5 1 2 Flowmeter Troubleshooting ...
Page 58: ...Page 58 of 64 SECTION 8 INFORMATION TABLES 8 1 Flowmeter Settings 8 2 Nozzle Selection Chart ...
Page 61: ...Page 61 of 64 Notes ...
Page 62: ...Page 62 of 64 ...
Page 63: ...Page 63 of 64 ...
