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
RED
RED
RED
RED
RED
BLK
BLK
BLK
BLK
BLK
BLK BLK
Hydraulic
Valve
Block
Coil
Hydraulic
Pump
LIFT
SWITCH
DUMP
SWITCH
BLU/
WHT
BLU/
WHT
GRN/
WHT
GRN/
WHT
GRA
BLU
BLU
GRN
GRN
BLK
BRN
BRN YEL
YEL
BRN
BLK
GRN BLU
UP
DOWN
OFF
Hydraulic
Valve
Block
Coil
JUNCTION
BOX
JUNCTION
BOX
87
87A
85 86
30
87
87A
85 86
30
UP
DOWN
OFF

BATTERY
WALKER HD8400
Beginning S/N 2008-1708
ELECTRICAL SCHEMATIC
40 AMP
CIRCUIT
BREAKER
RED
REDRED
RED
RED
RED/
YEL
RED/
YEL
REDRED
RED
GRN GRN
BLU BLU
RED
GRN
BLU
RED
RED
RED
RED
BLK
BLK BLK
Hydraulic
Valve
Block
Coil
LIFT
SWITCH
DUMP
SWITCH
BLU
GRN
UP
DOWN
OFF
Hydraulic
Valve
Block
Coil
JUNCTION
BOX
JUNCTION
BOX
To Red Wire on Time-Delay Harness
UP
DOWN
OFF
BLK
BLK
RED/YEL
RED/
YEL
Hydraulic
Pump
87
85
87A
30
BLK 86