Gardner Bender HYDRAULIC HAND PUMPS AND CYLINDERS - Manual (Page 3)

2. Operate pump handle.
3. To retract cylinder plunger, turn release valve counterclockwise as
illustrated in Figure 7.
4. Pumps can be operated while they are horizontal or vertical as long as
the hose end is down.
MAINTENANCE
1. To check oil level in pump, open pump release valve to allow oil in
cylinder (if connected) to return to pump.
2. Remove fill cap and add GB/ENERPAC hydraulic oil until level with
mark on rear cap. DO NOT overfill. To function properly, all hand
pumps require air in the reservoir. If oil level is too high, the pump will
not operate.
3. If hydraulic system is used under extremely dirty conditions, frequently
drain pump completely.
4. Refill with clean GB/ENERPAC hydraulic oil.
5. Install fill cap and close it.
REPLACING COUPLERS
To assemble to hose:
1. Clamp the hexagon nut of the hose fitting in a vise as illustrated in
Figure 9.
2. Remove the old coupler or rigid adapter.
3. Install the new coupler clockwise onto
hose fitting to a firm fit. Use high quality
thread sealer on threads (one wrap only).
A kit has been prepared for the purpose of
replacing a worn out seal and may be
obtained at your nearest GB Authorized
Service Center.
To assemble Spee-D-Couplers to cylinder:
1. Use wrench to unscrew old coupler half
from cylinder.
2. thread new coupler to cylinder and tighten
firmly. Use a high quality thread sealer on
coupler threads (one wrap only).
HYDRAULIC CYLINDERS
Figure 11
Single-Acting Hydraulic Cylinders
Figure 12
Double-Acting Hydraulic Cylinders
GENERAL INSTRUCTIONS
GB cylinders are designed for full rated capacity over the full plunger
travel. Refer to current GB catalog for capacity.
OPERATIONAL INSTRUCTIONS
Hydraulic Connections – All hydraulic cylinders must be properly
connected to the hydraulic pump to function. Always use thread sealer on
connections; i.e., teflon tape or equivalent. Figures 13 and 14 show the
basic connections of hydraulic cylinders to pumps.
Figure 7
Release Valve Positions
Figure 8
Location of Fill Valve
Figure 9
Assembling to Hose
Figure 10
Assembling Couplers to Cylinder
PUSH TYPE
• Hydraulic Advance
• Spring Retract
PUSH or
PULL TYPE
HOLLOW
PLUNGER
• Hydraulic
Advance
• Spring Retract
PULL TYPE
• Hydraulic Retract
• Spring Advance
GENERAL
PURPOSE
• Hydraulic Push
• Hydraulic Return
PUSH AND PULL TYPE
HOLLOW PLUNGER
• Hydraulic Advance
• Hydraulic Retract
PUSH AND PULL TYPE
PRECISION
MODELS
• Hydraulic Push
• Hydraulic Pull