Parts Replacement; Control Box Transformer Replacement; Hydraulic Oil Hoses Replacement; Motor/Pump Assembly Replacement - Kelley HK User Manual

Hydraulic dock leveler with three button control

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User manual (72 pages)

Table Of Contents

Table of Contents

conTroL box TransforMer — 3 PHase onLy

When replacing the transformer make sure jumper wires

are installed per wiring diagrams, for appropriate phase

and voltage.

HyDraULic oiL Hoses

When removing hydraulic oil hose(s) remove from motor/

pump assembly first then from cylinder assembly.

When installing hydraulic oil hose(s) attach to cylinder

first, making sure O-ring is in place, then attach to pump/

motor assembly.

Be certain, before climbing into the dock leveler pit or

doing any maintenance or repair under the dock leveler,

that:

1) THE MAINTENANCE STRUT AND LIP LOCK ARE

SECURELY IN PLACE, [see Fig. 38] and

2) the power is disconnected and properly tagged or

locked off.

After replacing hose and/or motor pump assembly, run

pump/motor at least four (4) times with the maintenance

strut and lip lock in place. This is required to remove air

from the system. Check oil level and add oil if required.

Use extreme care when removing maintenance strut

and lip lock. Ramp and lip could move down rapidly if air

remains in the system. Run dock leveler four (4) times

through the complete operating cycle before placing

dock leveler into service.

MoTor/PUMP asseMbLy

To set the downward speed of the ramp:

1.1 Loosen needle valve locking nut. See Fig. 46.

1.2 Turn valve in 1/4 turn increments only. "IN" clockwise

will increase time, "OUT" counterclockwise will

decrease time. Tighten needle valve locking nut.

1.3 Raise ramp and lip.

1.4 Time ramp float down time. Ramp should lower to

below dock stop per chart at right.

1.5 Repeat 1.1 through 1.4 until correct.

adjust valve "oUT" in 1/4 turn increments only to

achieve proper lowering time.

January 2009

6004754F — HK and HK-S Hydraulic Dock Leveler, 3 Button — Safe