Walker Hi-Dump Instruction Manual

Hi-Dump Operation

April 5, 2005

Lift Switch Operation

1. Pump runs.

2. The valve solenoids do not activate. Oil goes thru the valves to the cylinder.

3. The relays are not energized. Current goes thru in their normal position.

Dump Switch Operation

1. Both relays are energized.

2. Both valve solenoids are activated.

3. The pump runs.

If the switches are good suspect one of the relays. Even though we have not seen any of the

relays fail to date we are going to higher rated relays . When you engage the dump switch

you should feel the relays energize.

If the pump does not run most likely the problem is a relay.

If the pump runs but the cylinder won't move the problem could be a stuck valve or one of the

solenoids on the valves not activating.

Another area to look at is the terminals in the relay plugs. They push on very hard and

sometimes a terminal will back out as the plug goes on.

Hi-Dump Operation

Series Wound Motor S/N 2008-1508 & ON

Lift Switch Operation

1. SPDT switch controls direction of pump motor rotation.

2. Valve block spools do not shift and oil is directed to the lift cylinder.

3. Pump rotation dictates the cylinder direction.

Dump switch Operation

1. DPDT switch controls direction of pump motor rotation.

2. Solenoids are energized in both up and down positions of switch.

3. With solenoids energized spools shift in the valve block directing oil to the dump cylinder.

4. Pump rotation dictates the cylinder direction.

HI-DUMP®ATTACHMENT ADJUSTMENTS

1. Adjust the lift section of the Hi-Dump®by adjusting the two long control rods with ball

joints on the ends. These ball joints have LH and RH threads. To adjust, loosen the jam

nuts on each one and turn the rods. They must be adjusted equally.

2. Check the LIFT operation as follows:

The front of the catcher should lift about 1” (25.4mm) before the rear starts to rise. If the

front raises more than 1” (25.4mm) before the rear starts to rise, shorten the control rods.

If the back raises before the front raises 1” (25.4mm), or if the back of the box is slightly

raised in the full down position, lengthen the control rods. Always adjust rods equally.

3. Check the DUMP operation as follows:

Raise the lift section about 12" (30.5cm). Now fully tilt the dump section.

Loosen the two bolts that attach the dump hydraulic cylinder.

Lower the catcher box to the full down position and retighten the two cylinder mount

bolts.

Lower the lift to the full down position and recheck dump operation.

07/15/05

Hydraulic Pressure Test Manifold

Qty Part # Discription

2 25.901-5000#-1/4LM NOSHOK Pressure Gauge

1 PN400S PARKER Needle Valve

2 1/4 MMS-S PARKER Branch Tee, NPT

2 4-4 FLO-S PARKER Male O-Ring Face Seal to Male NPT Straight Adapter

Optional, Customer Can use existing plumbing if available:

2 60-JC-JC-4-4-4-16.00" PARKER Hose Assembly

2 4 C5OLO-S PARKER Male O-Ring Face Seal to Male O-Ring Boss Elbow Adapter

BATTERY

WALKER HD8400

ELECTRICAL SCHEMATIC

RELAY - A RELAY - B

40 AMP

CIRCUIT

BREAKER

RED

REDRED

RED

BLK

BLK BLK

Hydraulic

Valve

Block

Coil

Hydraulic

Pump

LIFT

SWITCH

DUMP

SWITCH

BLU/

WHT

BLU/

WHT

GRN/

WHT

GRN/

WHT

GRA

BLU

GRN

BLK

BRN

BRN YEL

YEL

BRN

BLK

GRN BLU

DOWN

OFF

Hydraulic

Valve

Block

Coil

JUNCTION

BOX

JUNCTION

BOX

87A

85 86

87A

85 86

DOWN

OFF

BATTERY

WALKER HD8400

Beginning S/N 2008-1708

ELECTRICAL SCHEMATIC

40 AMP

CIRCUIT

BREAKER

RED

REDRED

RED

RED/

YEL

RED/

YEL

REDRED

RED

GRN GRN

BLU BLU

RED

GRN

BLU

RED

BLK

BLK BLK

Hydraulic

Valve

Block

Coil

LIFT

SWITCH

DUMP

SWITCH

BLU

GRN

DOWN

OFF

Hydraulic

Valve

Block

Coil

JUNCTION

BOX

JUNCTION

BOX

To Red Wire on Time-Delay Harness

DOWN

OFF

BLK

RED/YEL

RED/

YEL

Hydraulic

Pump

87A

BLK 86

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