ARO TWO-BALL PUMP Series Manuale dell'operatore - Pagina 4

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AIR AND LUBRICATION REQUIREMENTS

Filtered air will help extend the life of the pump, allowing the pump

to operate more efficiently and yield longer service life to moving

parts and mechanisms.

Install an air line filter to provide good quality clean and dry air.

Install it up stream from the regulator.

Use an air regulator on the air supply to control the pump cycle

rate. Install the regulator as close as possible to the pump.

In most installations, lubrication is not required. If the pump

needs to have lubrication, install an air line lubricator and sup-

ply it with a good grade of non-detergent oil or other lubricant

compatible with Nitrile seals and set at a rate not to exceed one

drop per minute.

INSTALLATION

Mount and secure the pump as required for the application.

Attach a ground wire from the pump ground screw to a suitable

ground.

PUMP DISASSEMBLY / REASSEMBLY

NOTICE: The unique design of this pump allows for quick basic

pump service without total removal from the drum (refer to the

views below).

DISASSEMBLY - All threads are right hand. Refer to figure 2. These

procedures are for the installation of repair kit parts. Disconnect air

supply and relieve all system pressure prior to servicing. Carefully

remove the parts, inspect parts for damage, nicks or excessive wear

and determine if any parts will need replacement.

Follow the three disassembly steps in the detail views below and

place the pump on a clean bench.

Remove (1) bolts. Remove (18) packing, (17) bushing and (16) "O"

ring.

Remove (36) adapter, releasing (10) muffler housing.

Grasp the (11) cylinder and remove the (20, 14) piston assembly.

Remove (15) lower cap and (3) track gasket. Remove (12) retain-

ing ring and (48) washer, then pull (14) piston off (20) piston

rod.

Remove (2) cap and (3) track gasket. Push on the large OD end

of the (7) spool to remove the (4) sleeve. Grab the nose of (7)

spool and pull out. Repeat for other sleeve and spool.

REASSEMBLY - Thoroughly clean and lubricate all seals and

bores with Shell Gadus S2 U1000 upon assembly. Replace all soft

parts with new ones included in the repair kit.

Note: Refer to the illustration (figure 2) for "U" cup lip seal direction.

Replace the seals on both the (7 and 54) spools and (4) sleeves.

A) Remove the four

nuts from the base

of the Air Motor.

Figure 3

Page 4 of 4

PLACING INTO SERVICE

Connect a fluid hose to the pump outlet. In most cases a pipe

sealant should be used on thread connection. Tighten all fit-

tings. Use caution not to damage threads.

START-UP

Turn the air regulator to "0" pressure setting.

Immerse the lower pump end into the material.

Open the dispensing device.

Start the pump cycling slowly by raising the pressure to 20 - 30

psig (1.4 - 2.1 bar).

Close the dispensing device. Allow the pump to stall and build

line pressure. Check for any leaks and tighten fittings as need-

ed. Adjust pressure as required for the application.

SHUTDOWN

Disconnect the air supply from the pump if it is to be inactive

for a few hours. Open the dispensing device to relieve line pres-

sure.

SERVICE

Locate the valve chamber on the (11) cylinder where the 3/8''

dia. hole is located and install one of the (4) sleeves. Insert the

(54) spool from the opposite end. Next, install the remaining

sleeve and spool.

Replace the (3) track gasket and install (2) cap.

Replace the (13) piston "U" cups (refer to figure 2 for proper

orientation). Replace the (19) "O" ring and assemble (14) piston

to (20) piston rod and retain with (48) washer and (12) retaining

ring.

Install the (20, 14) piston assembly using great care to collapse

the outer lip of the second "U" cup, allowing it to slip into the

cylinder.

Replace the (3) track gasket and install the (15) cap. Install the

(16) "O" ring onto the piston rod, replace (17) bushing and (18)

packing.

Replace the (25) "O" ring and re-attach the (24) inner check.

Slide the pump assembly back into the (26) base / lower pump

section. Press the sections together and align the air inlet and

pump outlet as required and replace the four (1) bolts and (27)

nuts, tighten to 80 in. lbs (9 Nm).

If the pump will not cycle or will not deliver material.

Be certain to check for non-pump problems including kinked,

restrictive or plugged inlet / outlet hose or dispensing device.

Depressurize the pump system and clean out any obstructions

in the inlet / outlet material lines.

Check all seals, including track gaskets.

Check direction of "U" cup lips.

PUMP DISASSEMBLY DETAIL

B) Grasp the lower motor

cap and pull out the motor

and upper section of the

lower section.

Figure 4

OPERATION

TROUBLESHOOTING

C) Unlock the (24) inner

check from the piston

rod.

Figure 5

PN 97999-1892

650125-M (en)