Gardner Bender HYDRAULIC HAND PUMPS AND CYLINDERS - Manual (Page 2)

VALVING: For Single-Acting cylinders, use a pump with a 2-way or 3-
way valve and one hose.
For Double-Acting cylinders, use a pump with a 4-way valve and two
hoses.
OIL CAPACITY: Always use a pump that has an oil reservoir capacity
sufficient to fully advance or retract your cylinder.
PUMP TYPES
Hand Pumps – Use hand pumps for low speed cylinder applications.
Power Pumps – Use power pumps for applications requiring high speeds
and for large cylinders.
SINGLE-ACTING CYLINDERS
Figure 1
Assembling Single-Acting Hydraulic Cylinders to Pumps
HYDRAULIC HAND PUMPS – Manual 2-way or Manual 3-way Valves
Figure 2
Operating Hydraulic Hand Pumps with Integral Release Valves
Figure 3
Operating Hydraulic Hand Pumps with External Valves
DOUBLE-ACTING CYLINDERS
Figure 4
Assembling Double-Acting Hydraulic Cylinders to Pumps
HYDRAULIC HAND PUMP – Manual 4-way Valves
Figure 5
Operating Hand Pumps (Two Speed) with Pump Mounted External Valves
REMOVING AIR
When hoses, cylinders, and other components are connected to build a
system, air will be trapped in it. To function properly, the air in the system
must be removed. However, the hand pump does require air in the
reservoir to prevent a vacuum. If the pump reservoir is totally filled and
the vent cap is closed tight, the vacuum created will prevent oil flow out of
the pump. Fill reservoirs only to the level indicated on the pump and cap.
Figure 6
Air In Cylinder Systems
To remove air from a Single-Acting cylinder system:
1. After all system components are connected to the hand pump, check
reservoir oil levels. Fill to indicator mark on the end cap. Replace the
fill cap and be sure it is closed (not in vent position).
2. Turn pump release valve to closed position. Operate hand pump until
cylinder plunger is completely extended.
3. Invert cylinder (plunger end down). Open the pump release valve. As
the plunger retracts, the air in the system will be forced into the pump
reservoir and replaced by oil. Close the release valve.
4. Turn the cylinder upright. Operate the pump to cycle the cylinder
plunger. If air is out of the system, the plunger will advance and retract
smoothly. If the plunger is erratic, repeat steps 1 through 4.
5. Open the pump fill cap and check the oil level. Fill to the indicator mark
on the end cap.
To remove air from a Double-Acting cylinder:
1. After all system components are connected to the hand pump, check
pump reservoir oil level. Fill to the indicator mark on the pump end cap.
Replace end cap and turn to the “closed” position.
2. Place hand pump in a place where it will be higher than the hydraulic
cylinder. Lay the hydraulic cylinder on its side with the couplers facing
up.
3. Close the pump release valve (finger tight). Operate the pump to
advance and retract the cylinder plunger three or four times.
4. Open pump release valve to retract the cylinder plunger. Check pump
oil level. Add oil as necessary to restore correct level in the reservoir.
ADVANCING AND RETRACTING CYLINDER PLUNGER
1. To advance cylinder plunger, turn pump release valve clockwise as
illustrated in Figure 7 and close finger tight.
To avoid release valve
damage,do not use tools to
tighten valve. ! CAUTION
Model Pressure Reservoir Oil Volume Piston Piston
Number Type Rating Capacity Per Stroke Diameter Stroke
(PSI) (Cu. In.) (Cu. In.) (In.) (In.)
PH-39 0 to 10,000 55.0 .151 7/16 1
PF-65 0 to 6,500 22.0 .16 1/2 13/16
PH-80
0 to 350 140.0 .99 1 1/8
1
350 to 10,000 .15 7/16
PH-84
0 to 350 140.0 .99 1 1/8
1
350 to 10,000 .15 7/16
PH-20
0 to 200 20.0 .221 3/8
1/2
200 to 10,000 .055 3/4
SI
NG
LE
SP
EE
D
TW
O
SP
EE
D
NOTE: Hand pump fill cap has two positions,
1/4 turn for venting or 1/2 turn to close.
ADVANCE
1. Close release valve
finger-tight by turning
handle (near hose end
of pump) clockwise.
2. Operate pump handle.
RETRACT
Open release
valve by turning
handle (near hose
end of pump)
counterclockwise.
SINGLE SPEED
MODELS
TWO SPEED
MODELS
ADVANCE
Close release valve
by turning handle
clockwise. RETRACT
Open release valve
by turning handle
counterclockwise.
SINGLE SPEED
MODELS
RETRACT ADVANCE NEUTRAL
AUTOMATIC
TWO-SPEED
RELEASE
VALVE
FILL
CAP