Enerpac GBJ-Series User Manual

Page 3

5.2 Lifting the Load

1. Using rectangular end of pump handle, turn relief

valve stem clockwise until valve is fully closed.

CAUTION: To prevent damage, do not use
excessive force when closing the release valve.

2. Position jack under proper lift point. Refer to Section

8.0 for jack transporting and positioning information.

3. Insert pump handle into handle socket. Length and

quantity of handle segments will vary, depending on
jack model.

Note: Model GBJ-100 has two pumps. For this jack
model, insert pump handle into the socket on the low
pressure pump.

4. Operate pump handle until the saddle makes solid

contact with the load. On models equipped with an
extension screw, adjust the screw height as required.
Be sure that the load is perpendicular to the center of
the jack saddle.

WARNING: During
lifting, the inclined
load must not exceed

6 degrees. See Fig. 4.

5.0 OPERATION

5.1 Before Using the Jack

1. Inspect the condition of the jack before use. Do not

use the jack if it is damaged, missing parts or if it is
leaking oil. Refer to Section 6.3 for a detailed list of
inspection items.

2. Lubricate the pump linkage and pivot pins with

lubricating oil. Refer to Section 6.4 for lubrication
points.

3. Remove oil ﬁ ll/air release plug and check oil level.

Refer to Section 6.1 for oil speciﬁ cations and
additional information.

4. Using rectangular end of

pump handle, turn relief valve
stem counter-clockwise to
open valve (do not turn more
than two revolutions). See
Fig. 3.

5. Insert pump handle into

handle socket. Operate
handle 6 to 8 strokes. This
will help lubricate the pump’s
internal parts prior to lifting.

Note: If ram rises erratically or if a spongy feel is noticed
while pumping under load, perform air bleeding
procedure. Refer to Section 6.2.

Fig. 2 - Features and Components

Key:

1. Saddle (all except GBJ-002L)

2. Ram

3. Oil Fill/Air Release Plug

4. Handle Socket

5. Pump (all except GBJ-100)

6. Release Valve

7. Pump Handle

8. Low Pressure Pump

(GBJ-100 only)

9. High Pressure Pump

(GBJ-100 only)

10. Pressure Gauge

(GBJ-100 only)

11. Lifting Handle

(GBJ-020 thru
GBJ-100 only)

Models GBJ-002 - GBJ-050

Fig. 3 - Release Valve

Model GBJ-100

GBJ-002L ONLY

Fig. 4 - Inclined Load

OPEN CLOSE