SKF A Series Mode d’emploi

User and maintenance instructions

Model , series “A”

FlowMaster II hydraulic pump

and reservoir assembly

Date of issue August 2021

Form number 404780

Version 2

Contents

EC Declaration of Incorporation . . . . . . . 

Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Explanation of safety signals . . . . . . . . . 

Appropriate use. . . . . . . . . . . . . . . . . . . 5

Description. . . . . . . . . . . . . . . . . . . . . . . 5

Operation with system controller . . . . 5

Product speciﬁcations . . . . . . . . . . . . . 5

Installation. . . . . . . . . . . . . . . . . . . . . . . 6

Operation . . . . . . . . . . . . . . . . . . . . . . . . 6

Bare pump assembly . . . . . . . . . . . . . . . 

Bulk ﬁll reservoir . . . . . . . . . . . . . . . . . . . 

Maintenance and repair . . . . . . . . . . . . 7

General maintenance . . . . . . . . . . . . . . . 

In case of system malfunction . . . . . . . . 

Outlet check service . . . . . . . . . . . . . . . . 

Outlet check assembly . . . . . . . . . . . . . 7

Safety unloader valve . . . . . . . . . . . . . . . 

Vent valve service . . . . . . . . . . . . . . . . . . 

Vent valve assembly . . . . . . . . . . . . . . . 8

Troubleshooting . . . . . . . . . . . . . . . . . . 9

Service parts . . . . . . . . . . . . . . . . . . . . . 11

Warranty . . . . . . . . . . . . . . . . . . . . . . . . 12



EC Declaration of Incorporation

Manufacturer: SKF

 N. Hanley Road

St. Louis, MO U.S.A.

URL: SKF.com

Phone: --

EU Contact:SKF

Heinrich-Hertz-Straße -

 Walldorf

Phone:  () -

Product: Hydraulic FlowMaster pump

Model: 

Description: Lubrication pump

Year of construction: see type identiﬁcation plate

complies with all basic requirements of the following directives at the

time when ﬁrst being launched in the market.

Report No.’s: NA

The equipment indicated on this declaration complies with the fol-

lowing directives:

Machinery Directive //EC

And was evaluated using the following harmonized EN standards:

EN ISO :, EN ISO :, EN, EN 

European ROHS directive //EU

SKF declares under its sole responsibility that the model(s)

are in conformity with the Machinery Directive //EC.

In the case of modiﬁcations or alterations of the above mentioned

machine not authorized by the manufacturer, validity of this EC

declaration of conformity will cease. The person empowered to

assemble the technical documentation on behalf of the manufacturer

is the head of standardization; see EC-representative‘s address.

Brad Edler

Manager Product Development

Product Engineering LPD North America

Innovation and Product Management



Safety

Read and carefully observe installation

instructions before installing, operating or

troubleshooting referenced equipment.

Assembly must be installed, maintained and

repaired exclusively by persons familiar with

instructions.

Adequate personal protection must be

used to prevent splashing of material on skin

or in eyes.

Always disconnect power source

(electricity, air or hydraulic) from pump when

performing maintenance on system.

Extreme caution should be used when

operating equipment as material leaks from

loose or ruptured components can inject

ﬂuid through the skin and into the body. If

any ﬂuid appears to penetrate the skin, seek

attention from a doctor immediately.

Do not treat injury as a simple cut. Tell

attending doctor exactly what type of ﬂuid

was injected.

Any other use not in accordance with

instructions will result in loss of claim for

warranty or liability.

Failure to comply may result in personal

injury and/or damage to equipment.

NOTE

Emphasizes useful hints and

recommendations as well as

information to prevent property damage

and ensure efﬁcient trouble-free

operation.

CAUTION

Indicates a dangerous situation that can

lead to light personal injury if

precautionary measures are ignored.

WARNING

Indicates a dangerous situation that

could lead to death or serious injury if

precautionary measures are ignored.

DANGER

Indicates a dangerous situation that will

lead to death or serious injury if

precautionary measures are ignored.

Explanation of

safety signals



Appropriate use

Pump on unit is exclusively designed

to pump and dispense lubricant using

hydraulic power only.

Do not exceed   psi (241 bar)

maximum speciﬁcation. Do not exceed

maximum supply inlet hydraulic pressure.

Exceeding rated pressure may result in

personal injury or damage to system

components.

Any other use not in accordance with

instructions will result in loss of claims for

warranty and liability.

Operation with

system controller

When system controller times out, lubrica-

tion cycle initiates. Solenoid is energized to

deliver electric pressure to pump and vent

valve. Pump begins dispensing lubricant

through injectors to bearings.

When lubrication cycle has completed,

pressure rises in system to actuate pressure

switch. As pressure switch actuates,

controller is reset to de-energize solenoid

valve, cutting power to pump and vent valve.

Pump stops, pressure vents and pressure

switch de-actuates. Controller begins timing

toward next lubrication event.

Product speciﬁcations

Operating working hydraulic pressure  psi (19 bar)

Maximum output pressure   psi (241 bar)

Hydraulic inlet ﬂow Up to  gal/min (7.6 l/min)

Pump ratio with manifold : at low inlet pressure,

– psi (21–24 bar) and

low inlet ﬂow, below  gal/min (7.5 l/min).

Pump ratio approaches : ratio at

higher inlet pressure and ﬂow.

Ambient operating temperature – to + °F (–29 to +66 °C)

Operating voltage  V

Hydraulic inlet port SAE 

Tank return port SAE 

Maximum hydraulic ﬂuid temperature  °F (121 °C)

Container capacity  lb (27.2 kg)

Description

Model  is a pump and reservoir

assembly designed to operate Centro-Matic

lubrication system. Unit includes vent valve

to relieve line pressure to recharge injectors.

Hydraulic pump and reservoir assembly

includes pressure reducing valve,

ﬂow control valve and solenoid operated

(V ) on/off valve with manual

override. Pressure reducing and ﬂow

control valves are factory preset and

are not adjustable.

Model  does not include pressure

gauge, and is fully automatic when used with

system controller and pressure switch.

Pump is double acting, dispensing

lubricant on both up and down strokes.

Unit is for use with SL-V, SL-, SL-,

SL- and SL- series injectors.



WARNING

Do not exceed   psi* (241 bar)

maximum supply inlet hydraulic

pressure or   psi (241 bar)

maximum outlet pressure.

Failure to comply can cause death

and/or serious personal injury.

Operation

Bare pump assembly

Refer to manual 404584 for further pump

unit information.

Bulk ﬁll reservoir

Refer to Fig. IPB 1, page 10.

1 Remove lower and upper pipe plugs

from side of reservoir.

2 Attach appropriate bulk-ﬁlling pump to

lower inlet ( in NPT).

3 Fill reservoir until grease appears at top

high level port ( 1/4in NPT).

4 Replace both pipe plugs.

WARNING

Do not over-pressurize reservoir during

ﬁll process.

Failure to comply can cause damage

to reservoir, death and/or serious

personal injury.

Installation

Place unit in approximate location where

electric and hydraulic power connections

are accessible.

1 Mark center locations of six holes at

bottom of reservoir.

2 Drill six 1/2in.(13 mm) holes.

Use 7/16 in (11 mm) bolts for added

ﬂexibility in securing reservoir to

equipment.

3 Connect lubricant outlet of pump to

system with suitable hose capable of

  psi (241 bar) working pressure.

Connect hydraulic inlet with at least

3/8in (9 mm) ID hose capable of at least

  psi (241 bar) operating pressure.

Connect hydraulic return to tank connection

line with 3/4in (19 mm) ID hose or pipe.

On model , both ﬂow rate,

 gal/min (7.61 l/min) and

pressure,  psi (19 bar),are

factory set and non-adjustable.

*Indicates change



1/4 in

NPTF

Maintenance and

repair

General maintenance

• Keep area around pump and ﬁlling port

clean, especially prior to ﬁlling reservoir,

as lubricants attract dirt and debris.

• Keep lubricants free of contaminants.

In case of system

malfunction

Refer to Troubleshooting, page 9 to

determine where to look if problems occur.

Outlet check service

Refer to Fig. 1. Pump will not build up

sufﬁcient lubricant pressure if outlet

check assembly (36) is fouled.

Foreign material may lodge beneath steel

check ball (15) and seat of pump check

disk assembly (11). Sealing surfaces of

seat must fully seal.

1 Remove hose assembly (25).

2 Remove entire outlet check

assembly (36) and adapter (35).

3 Remove adapter (35) from outlet

check assembly (36).

4 Remove outlet connector (16) from

outlet check bushing assembly (12).

5 Remove ball check seat (13) from

outlet connector (16).

Fig. 1

Outlet check assembly (36)

WARNING

Disconnect all hydraulic or electric

power to equipment before performing

maintenance or service.

Failure to comply can cause death

and/or serious personal injury.

6 Inspect all check components (11, 12,

13, 15) for presence of foreign material,

scoring and or other damage, which

may cause internal leakage.

Replace components if damaged.

7 Always replace gaskets (10, 14) when

outlet check bushing is disassembled.

8 For assembly, torque outlet

connector (16) and outlet check bushing

assembly (12) to  lbf. ft. (13.5 Nm).



in. NPTF

/4 in.

NPTF

3/4 in.

NPTF

Safety unloader valve

Refer to Fig. IPB 1, page 10. If pressure

switch fails to operate, safety unloader

assembly (5) activates at lubricant pressure

of   to   psi (259 to 293 bar) to

relieve supply line pressure. Safety unloader

assembly (5) is not serviceable and must be

replaced if malfunctioning.

Upon reassembly, tighten to

 lbf. ft. (13.5 Nm). Safety unloader

is preset and non-adjustable.

Vent valve service

Refer to Fig. 2.

1 Loosen hose assembly (25) and

vent hose assembly (8).

2 Remove hex head cap screws (2) and

lock washers (40). Remove vent valve

assembly (4).

3 Position vent valve assembly in vice

with vice jaws gripping ﬂats on

vent valve base.

4 Remove elbows (6, 9).

5 Remove hydraulic cylinder (17) with

piston and u-cup assembly (18).

6 Remove packing assembly (20) from

hydraulic cylinder (17).

7 Inspect needle (19) and valve seat (21)

for lodged foreign matter preventing

needle from sealing in valve seat.

8 Clean and inspect again for damage.

Replace if valve seat (21) appears

damaged by nicks, grooves or scoring.

9 Remove valve seat (21) from

valve body (23) by placing 3/4in open

end wrench onto ﬂats and loosening

seat.

WARNING

Do not operate without safety unloader.

Safety unloader ships with pump

assembly, but is not pre-installed.

Safety unloader must be installed

before using pump.

Failure to comply may result in death

or serious personal injury

WARNING

Do not plug outlet of safety unloader.

Plugged safety unloader outlet will

result in pressure build up.

Failure to comply may result in death

or serious personal injury

NOTE

Replace packing assembly (20) if

grease leakage is evident from side of

hydraulic cylinder (17).

NOTE

Elbow (9) must be facing down.

Elbow (6) must be rotated

approximately ° toward vent hose

to prevent excessive rubbing of

hydraulic hose on pump.

Fig. 2

Vent valve assembly (4)

10 Replace valve seat (21) if damaged.

11 Remove and replace check seat

gasket (22) below valve seat (21).

12 To ease assembly, coat needle (19) and

hydraulic cylinder (17) inside diameter

with lubricant.

13 Install valve seat (21) into

valve body (23) and torque to

 lbf. ft. (39 Nm).

14 Install hydraulic cylinder (17) onto

valve body (23) and torque to

 lbf. ft. (135 Nm).



Troubleshooting

Condition Possible cause Corrective action

Pump does not operate. No hydraulic power to pump. Turn on or connect hydraulic supply to pump.

• Closed supply line shut-off valve. Open shut-off valve.

• No power to solenoid valve. Correct electrical fault.

• Faulty solenoid. Replace solenoid.

• Insufﬁcient hydraulic ﬂuid supply. Check hydraulic supply for proper pressure

and ﬂow.

• Closed ﬂuid outlet line. Check outlet line and clear obstructions.

• Pump is stalled due to grease back pressure. Check vent valve in system.

Pressure is seized or damaged. Dismantle the pump and repair defective or

seized component.

See pump manual 404584.

Pump runs excessively. Pump tube malfunction. Refer to pump service page.

Outlet check damage or contamination. Repair check or remove contamination.

Vent valve damage or contamination. Repair vent valve or remove contamination.

System component leaking. Repair leaks.

Vent valve not staying closed due to

insufﬁcient pressure.

Oriﬁce ﬁtting plugged.

Injector bypassing. Repair injectors.

Pump speeds up or runs erratically. Low level of grease or reservoir is empty. Reﬁll reservoir.

Pump piston or checks are worn. Refer to pump service sheet.

Pump runs, but output is low. Insufﬁcient hydraulic ﬂuid supply. Check hydraulic supply.

Inlet pressure too low. Increase pressure.

Faulty inlet or discharge check valve in pump. Replace faulty components.

See pump manual 404584.

Lubricant leaking from safety unloader valve. Pressure of system set too high. Adjust pressure switch setting.

Safety unloader damaged or contaminated. Replace safety unloader.

Lubricant leaking from weep hole in vent valve. Vent valve lubricant seal damaged. Replace lubricant seal.



6 7

39 4)

411)

Ø15.12 in.

(384 mm)

11/4 in. NPT 5)

18.86 in.

(479 mm)

37.43 in.

(951 mm)

20˚

40˚

Ø13.88 in. (353 mm) 8)

6 × Ø.50 in.

(13 mm)

1 in. NPT 6)

3/4 in. NPTF 7)

Fig. IPB 1

) Solenoid valve electrical connection,  V

) Hydraulic return to tank port, SAE 

) Hydraulic inlet port, SAE 

) Torque to  to  lbf-ft (12 to 14 Nm).

) Vent port

) Lube ﬁll port

) Lube outlet

) Bolt hole circle



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