Vestil EH-65-20 handleiding
Handleiding
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TABLE OF CONTENTS 5/12/2022 EH MANUAL
TABLE OF CONTENTS Copyright 2022 Vestil Manufacturing Page 14 of 19
9. Pressure-compensated flow control valve: Regulates the deck’s lowering rate. Located in the deck
cylinder’s port.
10. Hydraulic cylinders:
a. Deck cylinder - A displacement-style cylinder with a bleeder valve located at the top end raises
and lowers the deck. The bleeder valve allows air to be removed from the hydraulic system.
b. Lip cylinder - A double-acting cylinder extends and retracts the Lip.
11. Safety velocity fuse: Located in the deck cylinder’s hose port, it closes quickly in the event of a
catastrophic hose failure to prevent the deck from collapsing. The deck remains elevated until pressure is
reapplied to the cylinder.
12. Hydraulic fluid: The system uses HO150 hydraulic fluid. Anti-wear hydraulic oil with a viscosity grade of
150 SUS at 100°F (ISO 32 at 40°C), such as AW 32 or a non-synthetic transmission fluid is acceptable.
Pressing the RAISE button activates the dock leveler. The motor turns and spins the hydraulic gear
pump. Oil is drawn from the reservoir through the suction filter and into the pump. The pump forces
pressurized oil through the hydraulic manifold to the deck cylinder. Pressure first acts on the deck cylinder
causing it to extend, and then, causes the lip cylinder to extend. When the RAISE button is released, the
lip remains extended and the deck descends at a rate determined by the pressure-compensated flow
control valve. The lip eventually rests on the back end of the trailer. If the deck descends and contacts
the supporting frame, a limit switch is engaged. When in “AUTO” mode, the limit switch causes the leveler
to reset itself to the resting/cross-traffic position by turning on the motor for approximately 3 seconds. This
brief period is long enough to raise the deck and retract the lip. If the unit is in “MANUAL” mode,
engaging the limit switch only causes the lip to drop.
Issues & Solutions: additional solutions are found in the INSPECTIONS AND MAINTENANCE section.
Before beginning work to resolve either of the issues identified below, unload the dock leveler and
apply the maintenance prop. To install the prop, press and hold the RAISE button. Continue to hold the
button after the deck reaches its maximum elevation. A second person should install the free end of the
maintenance prop into the socket on the underside of the deck. Release the RAISE button to allow the
maintenance prop to seat firmly in the socket.
1. If the deck does not rise while the pump runs, remove the pilot-to-close check valve. Inspect and
clean the valve in the following manner:
a. Locate the pilot-to-close check valve, which is identified with the number “4” on the hydraulic
manifold, and remove it from the manifold.
b. Inspect the valve for debris. Inspect O-rings & back-up washers for cuts, tears, or other damage.
c. Immerse the valve in mineral spirits or kerosene. Use a thin tool, like a small screwdriver or a small
hex wrench, to push the check ball in several times from the bottom end of the valve. The ball should
move freely. If it sticks in, the valve might be defective. Replace the valve if the ball still does not
move freely after cleaning. Blow the valve off with compressed air, while simultaneously pushing the
check ball in-and-out.
d. Inspect the bottom of the valve cavity in the manifold (the chamber in the manifold that houses
the valve) for debris. Clean the valve cavity as needed.
e. Reinstall the valve. Tighten the valve in the manifold to approximately 20 lb•ft of torque.
2. If the platform lowers slowly or not at all, the velocity fuse of the deck cylinder might be closed. This is
typically caused by air in the cylinder. Bleed air from the hydraulic system to correct the problem. Hold a
rag over the bleeder valve of the deck cylinder. The valve looks like a grease zerk. Use a ¼ in. wrench to
turn the valve about 1/2 turn. Jog the motor by quickly pressing and releasing the RAISE button. Oil and
air will sputter from the valve. Continue this process until air no longer escapes from the valve; then close
the valve.
Bekijk gratis de handleiding van Vestil EH-65-20, stel vragen en lees de antwoorden op veelvoorkomende problemen, of gebruik onze assistent om sneller informatie in de handleiding te vinden of uitleg te krijgen over specifieke functies.
Productinformatie
| Merk | Vestil |
| Model | EH-65-20 |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 4662 MB |
