SKF A Series Instruction Manual

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


10
11
12
13
14
15
16
36
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).


17
18
19
20
21
22
23
1/
4
in. NPTF
3
/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.


1
2
3
4
5
6 7
8
9
9
10
24
25
26
27
28
29
30
31
33
34
35
36
37
38
39 4)
40
411)
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
3)
2)
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)
61
62
63
63
1 in. NPT 6)
3/4 in. NPTF 7)
26
55
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


Service parts
Item Description Part number Quantity Item Description Part number Quantity
Drum cover    Gasket )  
Hex head cap screw, 5/16- x 3/4in    Container assembly  
3/8- hex nut    Pipe plug, 1/2in  
 Vent valve assembly    Pipe plug,  in  
 Safety unloader assembly  )   Adapter  
Street elbow, 1/4NPT    Outlet check assembly  
 Hydraulic hose assembly    Reducer nipple, 1/2NPT x 1/4NPT  
Vent hose assembly    Solenoid valve w/manual override  
 Street elbow, 3/4NPT x 1/2NPT    Hex head cap screw, 1/4- x 1/4in  
 Gasket  )   Lock washer, 5/16 in  
 Pump check disk assembly  ) )   Solenoid coil, V  
 Outlet check bushing assembly  ) )   Gasket )  
 Ball check seat  )  Nut, 7/8-  
 Gasket  )   Elbow, adapter  
 Check ball, 3/8in  )   Elbow, vent tube  
 Outlet connector  )   Gasket, pump  
 Hydraulic cylinder    Lock washer, 1/4in  
 Piston and u-cup assembly ) )   Hex head cap screw, 1/2- x  in  
 Needle  )   Hex nut, 1/2-  
 Packing assembly, FPM  ) )   Lock washer, 1/2in  
 Valve seat  )   Lock washer, #  
 Check seat gasket    Gasket  
 Valve body    Cover  
 Bare pump assembly  )   Hex head machine screw, - x 5/8in  
 High pressure hose assembly    Pipe plug, 1/4in  
 Street elbow, 1/4NPT    Plug,  1/4NPT  
 Vent pipe    Extension tube  
 Eye bolt    Flow control valve  
 Hex head cap screw, 3/8- x  1/4in    Pressure control valve  
 Lock washer, 3/8in    Manifold assembly ) 
 Follower assembly  
 Pivot arm assembly  
 Body and guide assembly  
) Suggested service replacement component.
) Sold as an assembly. Individual parts not available.
) See manual 404584 for pump details.


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© SKF Group 
The contents of this publication are the copyright of the publisher and may not be reproduced (even
extracts) unless prior written permission is granted. Every care has been taken to ensure the accuracy
of the information contained in this publication but no liability can be accepted for any loss or damage
whether direct, indirect or consequential arising out of the use of the information contained herein.
August  · Form  Version 
Warranty
The instructions do not contain any information on the warranty.
This can be found in the General Conditions of Sales, available at:
www.lincolnindustrial.com/technicalservice or
www.skf.com/lubrication.