Bil-Jax ESP 19, Manual

Page: 23 / 96

23
HYDRAULIC SYSTEM
Hydraulic system maintenance varies by the amount
of use and the environment in which the lift vehicle is
used. Keeping the hydraulic oil clean and the
reservoir properly filled will help prevent possible
damage to the system.
Hydraulic System Inspection
Check all hydraulic hoses and fittings for leaks and
damage daily. Tighten or replace as necessary to
prevent hydraulic oil loss.
Fluid Check and Replacement
With the platform in its lowest position, the hydraulic
oil level should be at the MAXIMUM level mark (1-
1/2 in. from top of reservoir).
The reservoir is initially filled with Energol HLP-HD46
(BP Oil); a high grade, non-foaming hydraulic oil.
This oil is recommended for use in climatic
temperatures as low as -20
°
F/-29
°
C. Dextron
Automatic Transmission Fluid Type A is
recommended for use in temperatures as low as -
40
°
F/-40
°
C.
If either of these oils is not available, a good grade
SAE 10W hydraulic oil may be used where the
minimum climatic temperature is above 32
°
F/0
°
C.
An SAE 5W hydraulic oil may be used where
temperatures are as low as 0
°
F/-18
°
C.
Do not mix different hydraulic oils. Clean the
reservoir and sump strainer and replace the
hydraulic oil at least once a year. Clean the reservoir
and sump strainer and replace the oil whenever
contamination is suspected.
Hydraulic System Air Bleeding Procedure
Delayed response or uneven movement of the
hydraulic cylinder may indicate trapped air in the
hydraulic oil.
NOTE: Whenever the upper control box
emergency stop pushbutton is engaged, lift
operation remains enabled at the lower control
box. However, the UP or DOWN lift motion will be
intermittent. Intermittent lift motion should not
be mistaken as trapped air in the hydraulic
system.
Perform the following procedure to bleed trapped air
from the hydraulic system.
Fill the reservoir to the MAXIMUM level with the
proper hydraulic fluid.
Fully raise the lift platform.
Lower the lift platform to allow oil with entrapped
air to return to the reservoir. Be careful not to
overflow the hydraulic reservoir.
Leave the lift platform down and the lift vehicle
at rest for 10 to 15 minutes while air escapes the
hydraulic oil.
Repeat steps 2 through 4 as needed. Each time the
platform is lowered, refill the reservoir to prevent
pumping more air into the hydraulic cylinder.