Adjustments, Valve adjustment procedure hoke / kti – Poweramp EH SERIES HYDRAULIC User Manual

Page 29

4111-0004 —November 2003

Rev “B” February 2011

ADJUSTMENTS

S1 Sequence Valve 1

Controls the Platform Cylinder. When the leveler has

reached the top of its travel allow the leveler to float

down. Fluid should flow through the NV1 valve. If you

hear the motor spinning backwards, or Leveler and/or

Lip may dropping prematurely adjust S1 clockwise in

small increments, testing each time, until the motor is

not spinning backwards or Leveler and/or Lip may drop

correctly.

S2 Sequence Valve 2

Controls the Lip Cylinder. This valve should be set to

allow a smooth, quiet shift. Turning S2 counter-

clockwise causes the lip to extend.

If the lip does not extend turn S2 counter-clockwise out

small increments until lip begins to extend. Once the lip

is extended allow the powerpack to operate in pressure

relief, then allow the leveler to return below dock.

Raise the leveler and continue to adjust the S2 valve to

allow a smooth, quiet shift. When adjusted properly, the

lip should stay extended until below dock. Lip

extension cycle should not take more than a few

seconds.

NV1 Need Valve 1

Controls the Down speed of the ramp cylinder.

Increase Down speed by turning NV1 counter-

clockwise,

Decrease Down speed by turning NV1 clockwise.

RV2 Relief Valve 2

Allows the lip to collapse below dock, protects the lip if

it is backed in to. Set the RV2 valve by backing out

adjustment screw as far as it goes.

Return leveler to keepers and begin to raise it.

Halfway up, allow the leveler to return for a second,

then raise leveler. The lip should not extend. If lip

extends, turn S2 valve clockwise 1/4 turn and repeat

until lip does not extend.

PO CHK Pilot Operated Check Valve

Keeps Lip from collapsing until it is below dock. This

valve is not adjustable. If lip malfunctions, cleaning or

replacement may be required.

RV1 Main Relief Valve

Sets system pressure

2W 2 Way Normally Open Spool Valve - Optional

If present, can extend lip with Lip Out option or it can

be used as an emergency stop if power is not running.

A—S2 Valve

B— RV1 Valve

C—S1 Valve

D— 2W NO Spool Valve/Coil

E— NV1 Valve

F— Breather Tube/Fitting

G—To Hoist Cylinder

H—To Lip Cylinder

*Note: Not pictured on the bottom of the valve body are the RV2 and PO Check Valves

Valve Adjustment Procedure Hoke / KTI