Battery Cell Equalization; System Relief Valve - Upright ULII-25 Service & Parts Manual

4.3

BATTERY CELL EQUALIZATION

The specific gravity of the electrolyte in the battery cells
should be equalized monthly. To do this, charge batter-
ies as outlined in Battery Charging. After this initial
charge, check the electrolyte level in all cells and add
distilled water as necessary. Then, turn the charger on
for an additional eight hours. During this time, the
charging current will be low (four amps) as cells are
equalizing.
After equalization, the specific gravity of all cells should
be checked with a hydrometer. The temperature cor-
rected specific gravity in this state should be 1.260. If
any corrected readings are below 1.230, the battery
should be replaced.
Do not check the specific gravity in a cell to which
water has just been added. If there is not enough
electrolyte in a fully charged cell to obtain a sample for
the hydrometer, add water and continue charging for
one to two hours to adequately mix the water and
electrolyte.
Charging
Control
Ammeter
Figure 4-3: Battery Charger
UL-25/32/40/48 Portable Personnel Lifts
Maintenance
Charger Voltage
Switch
4.4 Setting System Relief Valve
(Figure 4-4)
Check the hydraulic system pressure whenever the
pump or relief valve has been serviced or replaced.
The hydraulic oil may be of sufficient
temperature to cause burns. Wear safety
gloves and safety glasses when handling
hot oil.
1. Install outriggers and level unit as normal, (see
section 3 for operating instructions), and operate the
hydraulic system for 5-10 minutes to warm the
hydraulic oil.
2. Remove Cover from Power Unit Assembly
3. Place rated load on the platform (see table 1-1 for
specifications). Do Not use live weight for this
procedure.
3. Remove the cap from the System Relief Valve
(fig. 4-4), and turn the adjustment screw counter-
clockwise two full turns.
4. Operate controls to elevate machine. (Machine will
not raise until Relief Valve is properly adjusted.)
5. Turn the System Relief Valve Clockwise (fig. 4-4)
until the machine begins to rise.
6. Replace cap on System Relief Valve, reassemble
Cover.
AC Power Unit
Figure 4-4: System Relief Valve
Section
4.4
DC Power Unit
4-5