Columbia AA4VG71 User manual

Knowledge Base
Article Type: Instructions
Hydrostatic Pump, 40/50 HP for
Models, 50/60
WARNING
Never work on, clean or service this unit, control panel or any machine or open
or remove any protective cover, guard, grate, door, or maintenance panel until
the power or energy sources has been turned off, locked out / tagged out, and all
moving parts have come to a complete stop and or blocked to prevent
movement. Machinery is dangerous –avoid personal injury and or death by
following manufacture, Local, and OHSA safety procedures. Contact Columbia
Machine for safety decals, guards, horns and beacons.
Description:
Instructions on “How to” properly adjust the Hydrostatic Pump 40/50 HP,
“AA4VG71”. Adjusting relief valves, fine and course adjustments,
checking oil temperature, and pump itemized breakdown.

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HYDROSTATIC PUMP
HYDROSTATIC
40/50HP PUMP
AA4VG71
Columbia Machine, Inc.
Vancouver, Washington
HYDROSTATIC PUMP SYSTEM INFORMATION
This manual provides information applicable to the Columbia Block Machine
16HF/1600 manufacturing s stems equipped with the H drostatic drive.
CONTENTS
Adjusting Relief Valves ............................................................................... 2
Fine Adjustment ......................................................................................... 4
Course Adjustment ..................................................................................... 5
Preparation for Adjustment ......................................................................... 6
Charge Pressure Setting ............................................................................ 7
Removal & Installation of Shaft Seal ........................................................... 8
Checking the Oil Temperature .................................................................... 9
Pump Itemized Breakdown....................................................................... 10

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HYDROSTATIC PUMP
NOTE
NOTE
PROCEDURES FOR ADJUSTING THE HYDROSTATIC
40/50- HP VT CARDS, COURSE AND FINE ADJUSTMENTS
AND ACCELERATION AND DECELERATION HIGH
PRESSURE CROSS PORT RELIEF VALVES
If the vibrator is rolling over in the neutral position, no signal to
run vibrator or is offline, remove the electrical pin connector
from the E-P controller if the vibrator stops the problem is
electrical. Adjustment to the VT-2 K or VTVSPA1 electrical
card can be done after all manual adjustment have been
completed. (Refer to electrical card adjustments). To proceed
with relief valve settings if vibrator continues to roll over with
electrical pin connector disconnected you must first adjust the
fine null adjustment. Refer to fine and course null
adjustments before continuing with this procedure.
Adjustment to the VT-2 K or VTVSPA1 electrical card can be
done after all manual adjustment have been completed.
(Refer to electrical card adjustments)
To adjust the model AA4VG71 pump, follow the steps below:
All high pressure relief valve adjustments on sizes 71 and 9
to be done with a 11 mm box wrench and a 19 mm box
wrench. On 125 and 18 to be done with a 5 mm allen wrench
and a 17 mm box wrench.
For new pump replacement, check to ensure that the orifice
plugs in Port X1 and Port X2 have been removed. If orifice
plugs have not been removed, remove orifice plugs and then
proceed to acceleration/deceleration relief cartridge set-up.
1. Make sure you have a charge pump pressure of 35 psi on the center gauge (see
picture for location.
2. Standing at the opposite end of the pump main shaft thereare two relief cartridges.
The one on the right is for acceleration and the one on the left is for deceleration. .
Note: In some applications acceleration and deceleration may be opposite. These
cartridges can be adjusted without removing cartridges. (See picture for location)
3. The pump must be set statically with both pressure lines plugged. Remove the two
high-pressure lines from the vibrator motor and cap the two hydraulic motor fittings
and plug the two hoses. There should not be any electrical voltage leak influencing
the E-P controller so remove the electrical pin connector from the E-P controller coil.
4. First test the acceleration pressure by manually pushing the detent pin located on the
bottom of the E-P controller in the center of the coil. Hold for just a few seconds to
see what the maximum gauge pressure is reading on the acceleration gauge (see
NOTE

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HYDROSTATIC PUMP
picture for location). If you have no acceleration or deceleration gauge pressure,
check to make sure tow option has been disengaged. To disengage tow option,
loosen lock nut and turn tow option screw all the way out until it stops and lock the
lock nut down. (See picture for location.) Acceleration pressure is to be set at 35
psi. Deceleration set at 25 psi. If gauge reading is above 35 or 25 psi to
decrease pressure turn adjustment screw out counterclockwise. This may only
require a small adjustment of possibly 1/32 turn. For increasing pressure turn screw
in clockwise. (See relief cartridge below for adjustment locations.) Acceleration and
deceleration pressures can be noted at gauges hooked to Ma and Mb ports.
5. Stroke the pump to approximately 2 percent of full flow in one direction and adjust
the high pressure relief for that flow direction. Acceleration pressure at 35 relief
should begin to open. Deceleration set at 25 psi. For the AA4VG71 and AA4VG9
one turn equals 22 psi (15 bar).
6. Remember one complete turn clockwise on AA4VG71 and 9 equals 22 psi (15
bar).
7. Make sure that the POR valve is not in use for our application. Turn POR valve in
clockwise until it stops do not over tighten. Back off counterclockwise ¼ to ½ turn
and lock down.
Tow Option Engagement for AA4VG71 and AA4VG 0 (Use a 4mm allen wrench)
To actuate tow option turn tow option engagement screw (Ref. #4) out three turns. To
Disengage tow option turn tow option engagement screw in until it stops.
Perform step 4 as quickly as possible to prevent overheating
of the pump. Flow should not be permitted to spill over the
high-pressure relief valves for longer than 1 seconds,
especially at higher temperatures.
High pressure relief valve adjustments on size 71 and 9 to be
done with a 11mm box wrench and a 19mm box wrench, 125
and 18 to be done with a 5mm allen wrench and a 17mm box
wrench.
1
234
Relief valve for AA4VG71 and AA4VG90
1 - Nut used to torque relief valve into port block.
- Lock nut for high pressure relief adjustment.
3 - Adjustment screw for high pressure adjustment.
4 - Tow option engagement screw.
NOTE
NOTE

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HYDROSTATIC PUMP
FINE ADJUSTMENT
The only time fine adjustment would be made is if electrical pin
has been disconnected and vibrator is still slightly rolling over.
Look at the acceleration and deceleration gauges. These will be the two outside gauges.
You will notice that at this time one of the gauges will have a higher reading then the
other.
With electrical pin connector disconnect from EP controller insert flat tip screwdriver into
adjustment screw slot and hold adjustment screw from turning while breaking jam nut
loose. While making your adjustment watch the gauges and with very slight adjustment
right or left of the adjustment screw you will notice one of the gauges increase in
pressure. Turn the adjustment screw the opposite direction and the other gauge will
start to increase in pressure. Turn the adjustment screw back until both gauges read
the same pressure. At this time hold the adjustment screw and lock the lock nut down.
Again check the gauges to make sure pressure are the same. Some times it may be
necessary when locking down the lock nut you may need to slightly turn the adjustment
screw back so when locking the lock nut down your pressures will be equal.
At this time your vibrator should not be rolling over.
If the vibrator is still rolling over and you cannot equal the pressures on both gauges you
will need to make adjustment to the course adjustment to center the pump and then
return to the fine adjustment procedures again once you have completed the course
adjustments.
NOTE
For fine adjustment
jam nut and slotted
screw is located here.