Page 122 Speed Level Series - Service & Parts Manual
January 2019
General Troubleshooting Tips
Hydraulic Fluid Pump: 3084ES Models
The 3084ES Aerial Work Platforms operate on a “Motor Control” theory in which fluid flow volume is
controlled by varying the speed of the DC electric motor driving a fixed displacement pump. 100% of
the fluid produced by the pump goes to the selected function.
Battery Charge State: 3084ES Models
Before you begin troubleshooting this model, check the battery state of charge and inspect the battery
connections for looseness or corrosion. A fully charged battery pack on a 48 Volts DC system will
have a nominal voltage of 52.5–54 Volts DC.
Common Causes of Electrical System Malfunctions:
Battery switch is turned OFF (located to the left of lower controls).
Battery connections are loose or corroded
Battery is not fully charged.
Emergency Stop buttons are pushed (OFF position).
Circuit breaker is in the tripped (OFF position).
Common Causes of Hydraulic System Malfunctions:
Hydraulic fluid level is too low.
Incompatible hydraulic fluids mixed, destroying the additives and causing varnish build up,
resulting in the valves sticking.
Water in the hydraulic fluid due to a damp climate.
Improper hydraulic fluid used. Viscosity too high in cold climates. Viscosity too low in warm
climates.
Hydraulic fluid contaminated with debris - filter change interval neglected.
Note:MEC uses a multiple viscosity fluid that is light enough for cold climates and resists thinning in
warm climates. Use only the recommended hydraulic fluid. Substituting with a lower grade fluid
will result in pump failure. Refer to “Lubrication” on page 81.
Note:Contamination always causes failure in any hydraulic system. It is very important to be careful
not to introduce any contamination into hydraulic system during the assembly procedures.
Please make sure all ports and cavities of the manifold and cylinders are properly covered/
plugged during maintenance activities.
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General Troubleshooting Tips
Section 9 - Troubleshooting - 3084ES Models
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