Gasboy 580 Series - Manual (Page 31)

MDE-4766 Series 580 Installation/Operation/Parts Manual · April 2009 Page 27
Meter Register Disassembly Maintenance and Troubleshooting
Inaccurate Delivery
Calibrate the meter (refer to “Wiring” on page 13 ).
A clock-fast error (more on the register than is delivered) in excess of 2.5% is due to air in the
suction line or vaporization of gasoline in the pump. Check pump for loss of prime and suction
line for air leak.
A clock-slow condition may result from: any slowing of the register or measuring chamber
due to excessive friction resistance or mechanical failure; inadvertent bypassing of the
measuring chamber. Check register for zero setback; check reset lever return to top of slot in
meter cover after setback; check for “hang-up” of number wheels in register or gears not
meshing.
Pump Delivers Product When not Turned On
In above ground storage tank, if fluid level is higher than pump, positive head pressure
may force product through pump. Install a pressure regulating valve or a solenoid valve
in the supply line to the pump.
Meter Register Disassembly
The B size measuring chamber can be removed for cleaning by taking out four meter body
screws, lifting off register assembly and removing three measuring chamber screws. After
separating and cleaning top and bottom half, reassemble, making sure baffle is seated in
grooves in top and bottom halves and through slot in measuring disc. Do not drop or sharply
strike chamber parts while handling. Rotate disc to make sure it turns freely and replace in
meter body. Do not overtighten screws. A torque of 20-25 ft-lbs is sufficient. When
reassembling register to meter body, use a new O-Ring.
4860 4 - Wheel Register Service
Note: Numbers in parentheses correspond to the numbers shown on the parts illustration and
parts list in “Parts List” on page 29 labeled 4860 4 - Wheel Register.
Replacing the Bearing and Seal Assembly
To replace the bearing and shaft seal assembly, or service the gear train on back of register
housing, remove housing from meter by taking out four screws.
Note: The meter housing will be full of liquid so some means should be available to catch
what drains from the case and lines.
To remove gears, remove three retaining rings and drive key. Withdraw the drive shaft and
gear, spacer, and all parts of bearing and seal assembly. Remove the nylon washer from item
26 and note its location. Remove both oilite bearings and both
O-Rings from bore in register housing. Using new parts, which consist of a new nylon washer,
two oilite bearings, and two O-Rings, reassembly parts in reverse order. Ensure that you
lubricate both O-Rings with an O-Ring lubricant before assembling.
Reassemble gear train in following sequence: gear, key, cluster gear, retaining ring, control
block, and retaining ring.