Vestil HIPM-2748-AIR handleiding
Handleiding
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Table of Contents Rev. 5/11/2020 HIPM, MANUAL
Table of Contents Copyright 2020 Vestil Manufacturing Corp. Page 13 of 18
OPERATION: If your unit was manufactured after 12-1-2018, refer to the separate MPU-GEN2 user manual.
AC powered units must be plugged into a wall outlet via the flanged inlet. See FIG. 4D on p. 10.
To raise the forks, press the white (UP) button on the hand control. Pressing the button activates the electric
motor, which turns the hydraulic pump. When the pump spins, oil is drawn out of the reservoir (inside the power unit).
It flows through a suction filter and into the pump. Pressurized oil then flows from the pump, through a check valve (to
prevent back flow when the pump is not running), and into the cylinder. Oil remains in the cylinder allowing the forks to
maintain elevation after the UP button is released.
If the weight of the load applied to the forks exceeds the capacity of the lifter, the forks will not rise even though the
UP button is pressed. Pressure will increase in the hydraulic circuit between the pump and the cylinder. When
pressure reaches a preset level, a relief valve unseats and allows oil to circulate back to the reservoir. Redirecting oil
during an overload situation prevents oil pressure from continuing to increase. Extremely high pressure might damage
the hydraulic system, for example hose ruptures.
To lower the forks, press the black (DOWN) button. This energizes the lowering solenoid valve coil, unseats the
poppet valve, and allows oil to return to the reservoir. As oil flows from the cylinders, it passes through a pressure
compensated flow control valve (PCFC). The PCFC limits the amount of oil leaving the cylinders. Limiting flow
ensures that the forks descend at a constant, controlled rate.
Releasing the DOWN button de-energizes the solenoid and closes the valve poppet. Both the closed poppet and
the check valve work to prevent oil from returning to the reservoir. Consequently, the cylinder stops retracting and the
forks maintain their positions.
LOWERING VALVE MAINTENANCE
The lifter is equipped with a cartridge lowering valve that requires virtually no maintenance. However, the valve
might occasionally require cleaning. To clean the valve, lower the forks completely. Remove the valve and follow
steps 1-4 below:
1. Use a thin tool to push the poppet in from the bottom to open the valve and then release it. Repeat
several times while immersing the valve in mineral spirits or kerosene.
2. Dry the valve. Blow compressed air through it while holding the poppet open as described in step 1.
3. Inspect all O-rings and the PTFE (polytetrafluoroethylene) washer. Replace any component that is nicked,
torn, cut, etc. Only use manufacturer approved replacement parts.
4. Reinstall the valve. Tighten the valve to ~20ft∙lb with a torque wrench.
VELOCITY FUSE
Inside the base of the cylinder is a brass velocity fuse with a stainless steel spring. The fuse is a safety feature that
activates if a hose or fitting fails causing rapid depressurization of the hydraulic circuit. Without the velocity fuse, the
forks would lower dangerously quickly. By including a velocity fuse, oil cannot flow out of the cylinder if oil flow rate
equals or exceeds a preset rate. The forks maintain position while the fuse is closed.
NOTE: The presence of air in the system can cause the velocity fuse to lock up even though no failure has
occurred. To reset the velocity fuse, activate the pump by pressing and releasing the white button several
times. Remove the load and cycle the forks up and down several times to purge air from the circuit.
HYDRAULIC CIRCUIT DIAGRAM
1.5" X 18"
DISPLACEMENT
CYLINDER WITH
INTERNAL
VELOCITY FUSE
LC/TC
LC/TC
LOWERING
VALVE
LY/FC
HYD.
PUMP
1 MTR
100 MICRON
SUCTION FILTER
10 MICRON
RETURN FILTER
ADJUSTABLE
PRESSURE
RELIEF VALVE
PRESSURE
CHECK
VALVE
ADJ. PRESSURE
RELIEF VALVE
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Productinformatie
| Merk | Vestil |
| Model | HIPM-2748-AIR |
| Categorie | Vorkheftruck |
| Taal | Nederlands |
| Grootte | 4943 MB |
