Meyer AG-10, Руководство по эксплуатации и обслуживанию

Страница: 23 / 45

TESTING TIPS
Many tests do not require removing the Power Unit from the vehicle. However,
more thorough testing can be done by using the Meyer Test Stand which allows
direct pressure and Amperage readings.
1. Use a screwdriver or other small tool to check for magnetism of solenoid coils
"A", "B" & "C". Place the tool on the nut securing the coil and have an assistant
operate the switch. You should feel strong magnetic attraction.
2. Use a test light or volt meter to determine whether there is power at harness or
switches.
3. When determining Ampere draw of motor, always obtain the highest value
possible, i.e., at maximum raise or angle with motor running.
4. Proper rotation for motor is indicated by an arrow on the top of the E-47 pump.
5. The pump shaft (all models) of a good pump can be turned smoothly using two
fingers. If it can't be turned easily, the pump is too tight and must be replaced.
6. Pump pressure can be measured at an angle hose (note pressure at full angle)
or in the pressure filter port (an adapter is necessary for the filter port). (See
Figure 0-3.)
7. If hydraulic system is contaminated it is recommended that the hydraulic unit,
power angling rams and hoses be drained and flushed clean. The system
should then be refilled with Meyer M-I oil. See pages 19-20.
GENERAL INFORMATION
Before any troubleshooting is started, make certain the
following conditions are met.
1. The moldboard is pointing straight ahead. This can often
be done by coupling the hose from the left cylinder into
the right cylinder and pushing the snow plow by hand.
2. The power angling cylinders must be installed correctly.
The left cylinder has a hose with a male half of a coupler
attached while the right cylinder only has the female half of
a coupler attached. Reverse them if installed on wrong
side.
3. The solenoid coils must be on their proper valve. The
"C"- coil (green wire) must be located on the valve closest
to the power angling hoses. The "B"-coil (red wire) is
positioned on the valve furthest from the power angling
hoses. The "A" coil (black wire) is smaller in diameter and
is easily located on the E-60 power unit. On the E-57
power unit, the "A" coil (black wire) is located on the back
side of the unit.
4. The electrical installation must have been made according
to instructions supplied by Meyer Products.
These charts are intended to be used as an aid in diagnosing problems on Meyer Hydraulic Power Units. They are not a substitute for factory
training and experience. Be certain to read the General Information and Testing Tips sections before attempting any troubleshooting. Additional
detailed information as well as all electrical schematics may be found in Service Manuals 1-667 (E60, E60H) and 1-562 (E46, E47, E57).
DIAGNOSTIC FLOW CHART FOR
HYDRAULIC POWER UNITS
21