WABCO MICO ACV-DMN-LS Operating instructions

Form No. 81-463-002 Revised 2013-09-05 (1) MICO, Inc.
PRODUCT EXPLANATION
The load sensing accumulator charging valve operates in
a low and pressure on demand system. The charging valve
senses the pressure in the accumulator(s). If pressure in
one or both accumulators is below a specied pressure
range the charging valve sends a pressure signal to a
pressure and ow compensated pump. The pump senses
the pressure signal from the charging valve and responds
by supplying ow to meet the demand from the charging
valve. Pressure in the accumulators rises as the volume of
oil increases in them. Flow rate to the pressure accumulators
is constant. The charging valve stops sending the pressure
signal when pressure in the accumulators reaches the high
limit of the charging valve. The accumulator charging valve
is connected to the hydraulic system in parallel to other load
sensing valves. The highest demand for pressure determines
the operating pressure of the system. A load sensing priority
valve and xed displacement pump may be used in place
of the pressure and ow compensated pump.
The pressure limiting device of the hydraulic system
limits pressure in the accumulators. The system must
be designed to ensure there is sufcient available ow
for all foreseeable operating conditions or has proper
priority function to ensure safe operation.
OPERATING INFORMATION
End user must provide proper maintenance of valve, should
it become inoperable, by replacing the valve or servicing it
with the proper repair kit. See TABLE 1 page 3 or TABLE 2
on page 5 for the proper repair kit number. Observe Service
Instruction procedures on following pages. See Warnings
A, B, C, and D below.
IMPORTANT INFORMATION
ACV-SMN-LS and ACV-DMN-LS
Single and Dual
ACCUMULATOR CHARGING VALVE
with Load Sensing
Product Explanation, Operating Information,
and Service Instructions
Due to allowable operating temperature of accumulator
charging valve avoid contact or burn injury may occur.
A
Be sure system energy is relieved from accumulator
charging valve before removing from machine. See
machine operating instructions for procedures to relieve
system energy.
B
Pressure in the accumulators is limited the the system
pressure limiting device. Adjustment outside of the
allowable range may result in system damage or failure.
C
Do not exceed the high limit pressure setting indicated
in TABLE 1 and 2 or system damage or failure may occur.
D

MICO, Inc. (2) Form No. 81-463-002 Revised 2013-09-05
VALVE ADJUSTMENT
(Refer to Table 1)
1. See machine servicing instructions to properly reinstall
accumulator charging valve. Tee an accurate pressure gauge
on an accumulator line.
2. Start pump and allow approximately one minute for charging
to start (pressure in gauge will read accumulator precharge plus).
If valve does not begin to charge, stop pump and remove end
plug (25) and turn screw (24) approximately 1/4 turn clockwise.
Reinstall end plug (25). Check the high limit specications
(see TABLE 1). Repeat as needed until the high limit setting
is met. Pressure limits can be checked correctly only if afte
each adjustment of screw (24) the accumulator pressure is
reduced below the low limit setting and the system recharges
the accumulator pressure to its high limit. NOTE: Be sure to
reinstall plug (25) before starting pump.
3. Torque end plug (25) 47.5-54.2 N∙m (35-40 lb∙ft).
SERVICE INSTRUCTIONS
Disassembly
(Refer to Figure 1)
1. Remove plug (1) from housing (10). Remove o-ring (2) from
plug (1).
2. Remove spring (3), poppet (4), sleeve (6), poppet (8) and
spring (9) from housing (10). NOTE: Be careful not to
scratch or mar housing or sleeve bore.
3. Remove o-rings (5 & 7) from sleeve (6).
4. Remove plug (25) from housing (10). Remove o-ring (12)
from plug (25).
5. BEFORE moving screw (24), ACCURATELY MEASURE ITS
DEPTH from the end of housing (10) and record for reassembly
purposes. Remove screw (24) from housing (10).
6. Remove spring (22), retainer (21), and ball (20). Be sure to
keep ball (20) separate from ball (15) for reassembly.
7. Remove pin (23) from screw (24) using a drive pin punch.
NOTE: Be careful not to damage threads.
8. Remove plug (11) from housing (10). Remove o-ring (12)
from plug (11).
9. Remove spring (13), stop (14), and ball (15) from housing (10).
10. Place housing (10) on a bench with plug (11) end down.
Spool (16) may or may not fall out at this point.
11. Using a 6.4-7.9 mm (0.25-0.31 in) diameter wood or plastic
dowel, carefully remove insert (17) and spool (16) from
housing (10). Insert (17) must come out plug (11) side of
housing (10). NOTE: Be careful not to scratch or mar
valve seats on insert (17).
12. Remove spool (16) from insert (17). Remove o-rings (18 & 19)
from insert (17).
13. Remove plug (34) from housing (10). Remove o-ring (33)
from plug (34).
14. Earlier Models: Using a 1/4-20 UNC bolt, remove sleeve
(32) and orice (29) from housing (10). Remove poppet or
steel ball (28), spring (27) and stop (26) from housing (10).
Remove o-ring (31) from sleeve (32) and o-ring (30) from
orice (29). NOTE: Not all models use stop (26).
Later Models: Remove sleeve (32) from housing (10). Using
a 1/4-20 UNC bolt, remove orice (29) from housing (10).
Remove poppet or steel ball (28), spring (27), and stop (26)
from housing (10). Remove o-ring (30) from orice (29).
NOTE: Not all models use stop (26).
Assembly
(Refer to Figure 1)
WASH ALL PARTS WITH CLEAN SOLVENT AND ALLOW TO
DRY. LUBRICATE ALL RUBBER PARTS WITH CLEAN SYSTEM
FLUID PRIOR TO ASSEMBLY. BE SURE ENTIRE ASSEMBLY
PROCEDURE IS DONE WITH CONTAMINATION FREE METHODS.
1. Install new o-rings (5 & 7) on sleeve (6).
2. Install spring (9), new poppet (8), sleeve (6), new poppet (4),
and spring (3) into housing (10).
3. Install new o-ring (2) on plug (1). Install plug (1) in housing (10)
and torque 122.0-135.6 N∙m (90-100 lb∙ft).
4. Install new o-rings (18 & 19) on insert (17) and install in
housing (10). Note direction of assembly. Seat insert (17)
using a 12.7 mm (0.50 in) diameter wood dowel.
5. Install spool (16) into insert (17) in housing (10). Note direction
of spool (16), long shoulder end is toward end plug (11), see
Figure 1a.
6. Install ball (15) on insert (17) in housing (10). Install stop (14)
on ball (15).
7. Install spring (13) over stop (14).
8. Install new o-ring (12) on plug (11) and install plug (11) in
housing (10), centering spring (13). Torque plug (11)
47.5-54.2 N∙m (35-40 lb∙ft).
9. Turn housing (10) so plug (25) end is vertically upward.
Install ball (20), 6.35 mm (0.25 in) diameter. Be sure ball (20)
is centered in bottom of hole in housing (10). Install retainer
(21) and spring (22) into housing (10).
10. Insert new pin (23) in screw (24). Be sure pin (23) is aligned
properly and is evenly driven into screw (24). NOTE: Do not
damage threads.
11. Thread screw (24) into housing (10) to the depth recorded
during disassembly.
12. Install new o-ring (12) on plug (25) and install plug (25) in
housing (10). Torque plug (25) 47.5-54.2 N∙m (35-40 lb∙ft).
13. Install new o-ring (30) on orice (29).
14. Install stop (26), spring (27), new poppet or steel ball (28), and
orice (29) in housing (10). Note order and direction of parts.
NOTE: Not all models use stop (26).
15. Earlier Models: Install new o-ring (31) on sleeve (32) and
install sleeve (32) in housing (10). Note direction of sleeve
(32). Install new o-ring (33) on plug (34). Install plug (34) into
housing (10) and torque plug (34) 122.0-135.6 N∙m
(90-100 lb∙ft).
Later Models: Install sleeve (32) in housing (10). Install new
o-ring (33) on plug (34). Install plug (34) into housing (10) and
torque plug (34) 122.0-135.6 N∙m (90-100 lb∙ft).
Be sure system energy is relieved from accumulator charging
valve before removing from machine. See machine operating
instructions for procedures to relieve system energy.
NOTE
Locate the model number on the accumulator charging valve
and compare it to the model number in TABLE 1. Be sure you
you have the proper service instructions.
NOTE
Observe torque specications as indicated in assembly
procedures or system damage or failure may occur.
Do not exceed the high limit pressure setting indicated in
TABLE 1 or system damage or failure may occur.
NOTE
Items 3 through 9 are not used in single accumulator charging
valves.
NOTE
Items 3 through 9 are not used in single accumulator charging
valves.

Form No. 81-463-002 Revised 2013-09-05 (3) MICO, Inc.
FIGURE 1
Figure 1a
TABLE 1 (Specications)
Model
Number Description Repair Kit Number
Nominal
High Limit (cut out)
Nominal
Low Limit (cut in)
bar (PSI) bar (PSI)
06-463-100
06-463-102
06-463-104
06-463-106
06-463-108
06-463-110
06-463-112
06-463-114
06-463-116
06-463-118
06-463-122
06-463-126
06-463-128
06-463-136
06-463-144
06-463-148
06-463-154
06-463-156
06-463-158
06-463-162
06-463-164
06-463-172
06-463-176
06-463-178
06-463-184
06-463-186
Dual
Single
Dual
Single
Single
Single
Single
Single
Single
Dual
Dual
Dual
Dual
Single
Dual
Dual
Dual
Dual
Single
Dual
Dual
Dual
Dual
Dual
Dual
Dual
06-400-107
06-400-107
06-400-107
06-400-107
06-400-107
06-400-107
06-400-107
06-400-107
06-400-107
06-400-107
06-400-192
06-400-107
06-400-107
06-400-107
06-400-107
06-400-107
06-400-107
06-400-107
06-400-107
06-400-107
06-400-107
06-400-316
06-400-107
06-400-107
06-400-107
06-400-107
77.6 ± 1.7 (1125 ± 25)
106.9 ± 3.5 (1550 ± 50)
144.8 ± 3.5 (2100 ± 50)
129.3 ± 1.7 (1875 ± 25)
158.6 ± 3.5 (2300 ± 50)
141.3 ± 3.5 (2050 ± 50)
158.6 ± 3.5 (2300 ± 50)
113.8 ± 3.5 (1650 ± 50)
103.4 ± 3.5 (1500 ± 50)
158.6 ± 3.5 (2300 ± 50)
144.8 ± 3.5 (2100 ± 50)
113.8 ± 3.5 (1650 ± 50)
189.6 ± 3.5 (2750 ± 50)
165.5 ± 3.5 (2400 ± 50)
200.0 ± 3.5 (2900 ± 50)
113.8 ± 3.5 (1650 ± 50)
200.0 ± 3.5 (2900 ± 50)
158.6 ± 3.5 (2300 ± 50)
186.2 ± 3.5 (2700 ± 50)
175.8 ± 3.5 (2550 ± 50)
158.6 ± 3.5 (2300 ± 50)
93.1 ± 3.5 (1350 ± 50)
184.4 ± 1.7 (2675 ± 25)
124.1 ± 3.5 (1800 ± 50)
127.6 ± 3.5 (1850 ± 50)
104.3 ± 2.6 (1513 ± 38)
55.2 ± 3.5 (800 ± 50)
74.1 ± 3.5 (1075 ± 50)
118.9 ± 3.5 (1725 ± 50)
104.3 ± 2.6 (1513 ± 38)
117.2 ± 3.5 (1700 ± 50)
115.5 ± 3.5 (1675 ± 50)
117.2 ± 3.5 (1700 ± 50)
93.1 ± 3.5 (1350 ± 50)
82.7 ± 3.5 (1200 ± 50)
127.6 ± 3.5 (1850 ± 50)
118.9 ± 3.5 (1725 ± 50)
86.2 ± 3.5 (1250 ± 50)
155.1 ± 3.5 (2250 ± 50)
127.6 ± 3.5 (1850 ± 50)
165.5 ± 3.5 (2400 ± 50)
86.2 ± 3.5 (1250 ± 50)
165.5 ± 3.5 (2400 ± 50)
127.6 ± 3.5 (1850 ± 50)
153.4 ± 3.5 (2225 ± 50)
144.8 ± 3.5 (2100 ± 50)
127.6 ± 3.5 (1850 ± 50)
79.3 ± 3.5 (1150 ± 50)
158.6 ± 5.2 (2300 ± 75)
86.2 ± 3.5 (1250 ± 50)
158.6 ± 3.5 (2300 ± 50)
129.3 ± 1.7 (1875 ± 25)
NOTE: If your product number is not listed, please contact MICO, Inc. for information.
NOTE
Model 06-463-118, 06-463-156 and 06-463-162
use a steel ball in place of poppet (28). This
steel ball is not included in repair kit. These
are also the only models that use stop (26).
 Items included in Repair Kit
▲ Used only in models 06-463-118, 06-463-156 and 06-463-162
Not used in single accumulator charging valves

MICO, Inc. (4) Form No. 81-463-002 Revised 2013-09-05
SERVICE INSTRUCTIONS
Disassembly
(Refer to Figure 2)
1. Remove plug (1) from housing (10). Remove o-ring (2) from
plug (1).
2. Remove spring (3), poppet (4), sleeve (6), poppet (8), and
spring (9) from housing (10). NOTE: Be careful not to
scratch or mar housing or sleeve bore.
3. Remove o-rings (5 & 7) from sleeve (6).
4. Remove plug (27) from housing (10). Remove o-ring (12)
from plug (27).
5. BEFORE moving screw (26), ACCURATELY MEASURE ITS
DEPTH from the end of housing (10) and record for reassembly
purposes. Remove screw (26) from housing (10).
6. Remove shim (24), springs (22 & 23), retainer (21), and ball
(20). Be sure to keep ball (20) separate from ball (15) for
reassembly.
7. Remove pin (25) from screw (26) using a drive pin punch.
NOTE: Be careful not to damage threads.
8. Remove plug (11) from housing (10). Remove o-ring (12)
from plug (11).
9. Remove spring (13), stop (14), and ball (15) from housing (10).
10. Place housing (10) on a bench with plug (11) end down.
Spool (16) may or may not fall out at this point.
11. Using a 6.4-7.9 mm (0.25-0.31 in) diameter wood or plastic
dowel, carefully remove insert (17) and spool (16) from
housing (10). Insert (17) must come out plug (11) end of
housing (10). NOTE: Be careful not to scratch or mar
valve seats on insert (17).
12. Remove spool (16) from insert (17). Remove o-rings (18 & 19)
from insert (17).
13. Remove plug (34) from housing (10). Remove o-ring (33)
from plug (34).
14. Remove sleeve (32) from housing (10). Using a 1/4-20 UNC
bolt, remove orice (30) from housing (10). Remove poppet
(29) and spring (28) from housing (10). Remove o-ring (31)
from orice (30).
Assembly
(Refer to Figure 2)
WASH ALL PARTS WITH CLEAN SOLVENT AND ALLOW TO
DRY. LUBRICATE ALL RUBBER PARTS WITH CLEAN SYSTEM
FLUID PRIOR TO ASSEMBLY. BE SURE ENTIRE ASSEMBLY
PROCEDURE IS DONE WITH CONTAMINATION FREE METHODS.
1. Install new o-rings (5 & 7) on sleeve (6).
2. Install spring (9), new poppet (8), sleeve (6), new poppet (4),
and spring (3) into housing (10).
3. Install new o-ring (2) on plug (1). Install plug (1) in housing (10)
and torque 122.0-135.6 N∙m (90-100 lb∙ft).
4. Install new o-rings (18 & 19) on insert (17) and place into
housing (10). Note direction of assembly. Seat insert (17)
with 12.7 mm (0.50 in) diameter wood or plastic dowel.
5. Install spool (16) into insert (17) in housing (10). Note direction
of spool (16), long shoulder end is toward end plug (11). See
Figure 2a.
6. Install ball (15) on insert (17) in housing (10). Install stop (14)
over ball (15) and spring (13) over stop (14).
7. Install new o-ring (12) on plug (11). Carefully install plug (11)
in housing (10), centering spring (13). Torque plug (11)
47.5-54.2 N∙m (35-40 lb∙ft).
8. Turn housing (10) so plug (25) end is vertically upward. Install
ball (20) in housing (10). Be sure ball (20) is centered in the
bottom of hole in housing (10). Install retainer (21), springs
(22 & 23), and shim (24) into housing (10).
9. Insert new pin (25) in screw (26). Be sure pin (25) is aligned
properly and is evenly driven into screw (26). NOTE: Be
careful not to damage threads.
10. Thread screw (26) into housing (10) to the depth recorded
during disassembly.
11. Install new o-ring (12) on plug (27) and install plug (27) in
housing (10). Torque plug (27) 47.5-54.2 N∙m (35-40 lb∙ft).
12. Install new o-ring (31) on orice (30).
13. Install spring (28), poppet (29), and orice (30) in housing (10).
Note order and direction of parts.
14. Install sleeve (32) in housing (10). Install new o-ring (33) on
plug (34). Install plug (34) into housing (10) and torque plug (34)
122.0-135.6 N∙m (90-100 lb∙ft).
VALVE ADJUSTMENT
(Refer to Table 1)
1. See machine servicing instructions to properly reinstall
accumulator charging valve. Tee an accurate pressure gauge
on an accumulator line.
2. Start pump and allow approximately one minute for charging to
start (pressure in gauge will read accumulator precharge plus).
If valve does not begin to charge, stop pump and remove end
plug (27) and turn screw (26) approximately 1/4 turn clockwise.
Reinstall end plug (27). Check the high limit specications
(see TABLE 2). Repeat as needed until the high limit setting
is met. Pressure limits can be checked correctly only if after
each adjustment of screw (26) the accumulator pressure is
reduced below the low limit setting and the system recharges
the accumulator pressure to its high limit. NOTE: Be sure to
reinstall plug (27) before starting pump.
3. Torque end plug (27) 47.5-54.2 N∙m (35-40 lb∙ft).
Be sure system energy is relieved from accumulator charging
valve before removing from machine. See machine operating
instructions for procedures to relieve system energy and to
remove charging valve from machine.
NOTE
Locate the model number on the accumulator charging valve
and compare it to the model number in TABLE 2. Be sure
you have the proper service instructions.
NOTE
Observe torque specications as indicated in assembly
procedures or system damage or failure may occur.
Do not exceed the high limit pressure setting indicated in
TABLE 1 or system damage or failure may occur.

Form No. 81-463-002 Revised 2013-09-05 (5) MICO, Inc.
 Items included in Repair Kit 06-400-316
FIGURE 2
Figure 2a
TABLE 2 (Specications)
Model
Number Description Repair Kit Number
Nominal
High Limit (cut out)
Nominal
Low Limit (cut in)
bar (PSI) bar (PSI)
06-463-166 Dual 06-400-316 186.2 ± 3.5 (2700 ± 50) 165.5 ± 3.5 (2400 ± 50)
NOTE: If your product number is not listed, please contact MICO, Inc. for information.

MICO, Inc. (6) Form No. 81-463-002 Revised 2013-09-05
CHARGING VALVE SERVICE DIAGNOSIS
(Refer to Figure 1)
REPEATS FREQUENTLY WHEN
ACCUMULATORS ARE NOT NORMALLY
BEING DISCHARGED IN SERVICE
1. Poppet or ball (28) leaking
2. O-ring (30) leaking
3. O-ring (18) leaking
4. Ball (15) leaking
5. Inoperative seat on insert (17)
ACCUMULATORS START TO CHARGE
BUT DO NOT REACH HIGH LIMIT
1. O-ring (19) leaking
2. O-ring (31) leaking (earlier models only)
ACCUMULATOR CHARGING
TIME TOO LONG
1. Poppets (4, 8, or 28) stuck, partially closed
2. Orice (29) partially plugged
ACCUMULATORS FAIL TO
START CHARGING
1. Broken spring (22)
2. O-ring (19) leaking
VERY RAPID CYCLING
OF CHARGING VALVE
1. Insert (17) worn
2. Poppets (4 or 8) stuck, partially closed
ACCUMULATOR PRESSURES ARE
NOT ISOLATED FROM ONE ANOTHER
1. O-rings (5 or 7) leaking
2. Inoperative poppets (4 or 8)
SERVICE CHECKS FOR HYDRAULIC SYSTEMS
ACCUMULATOR CHARGING CYCLE
REPEATS FREQUENTLY WHEN
ACCUMULATORS ARE NOT NORMALLY
BEING DISCHARGED IN SERVICE
1. Leaking accumulator lines or ttings
1. Check lines and ttings for leaks
and correct
2. Incorrect setting of accumulator gas
charge
2. Check accumulator gas charge
3. Line to accumulator plugged
3. Replace line
4. Inoperative charging valve
4. Replace charging valve
ACCUMULATORS START TO CHARGE
BUT DO NOT REACH HIGH LIMIT
1. No oil or low oil level in tank
1. Check oil level
2. Pump worn or inoperative and not
delivering full ow or pressure
2. Check pump
3. Inoperative system relief valve (valve
leaking or has low setting so full ow
and pressure are not available)
3. Check relief valve
4. Inoperative charging valve
4. Replace charging valve
ACCUMULATOR CHARGING TIME
TOO LONG
1. No oil or low oil level in tank
1. Check oil level
2. Relief valve setting too low
2. Check valve setting
3. Pump worn or inoperative and not
delivering full ow or pressure
3. Check pump
4. Inoperative charging valve
4. Replace charging valve
ACCUMULATORS FAIL TO
START CHARGING
1. No oil or low oil level in tank
1. Check oil level
2. Worn or inoperative pump
2. Check pump pressure and ow
3. Inoperative relief valve
3. Check relief valve setting
4. Air in accumulator line
4. Bleed accumulator line
5. Inoperative charging valve
5. Replace charging valve
VERY RAPID CYCLING OF
CHARGING VALVE
1. Incorrect setting of accumulator
gas charge
1. Check accumulator gas charge
2. Inoperative charging valve
2. Replace charging valve
LACK OF ADEQUATE FLOW
THROUGH VALVE
1. Inoperative pump
1. Check pump pressure and delivery
2. Inoperative relief valve
2. Check relief valve setting
3. Blocked lines
3. Replace lines
4. Inoperative charging valve
4. Replace charging valve
CHARGING VALVE SERVICE DIAGNOSIS
(Refer to Figure 2)
REPEATS FREQUENTLY WHEN
ACCUMULATORS ARE NOT NORMALLY
BEING DISCHARGED IN SERVICE
1. Poppet (29) leaking
2. O-ring (31) leaking
3. O-ring (18) leaking
4. Ball (15) leaking
5. Inoperative seat on insert (17)
ACCUMULATORS START TO CHARGE
BUT DO NOT REACH HIGH LIMIT
1 O-ring (19) leaking
2. O-ring (31) leaking
ACCUMULATOR CHARGING
TIME TOO LONG
1. Poppets (4, 8, or 29) stuck, partially closed
2. Orice (30) partially plugged
ACCUMULATORS FAIL TO
START CHARGING
1. Broken spring (22 or 23)
2. O-ring (19) leaking
VERY RAPID CYCLING
OF CHARGING VALVE
1. Insert (17) worn
2. Poppets (4 or 8) stuck, partially closed
ACCUMULATOR PRESSURES ARE
NOT ISOLATED FROM ONE ANOTHER
1. O-rings (5 or 7) leaking
2. Inoperative poppets (4 or 8)

Form No. 81-463-002 Revised 2013-09-05 (7) MICO, Inc.

MICO is a registered trademark of MICO, Inc. MICO is registered in the U.S. Patent and Trademark Ofce as well as in Australia, Canada, Indonesia, Japan, Peoples Republic of China, South Korea, and the European Community.
MICO, Inc.
1911 Lee Boulevard / North Mankato, MN U.S.A. 56003-2507
Tel: [phone] Fax: [phone]
Form No. 81-463-002 Revised 2013-09-05 www.mico.com
This document is intended to provide general information about MICO Products. MICO, Inc. has attempted to present accurate information about MICO Products in its catalogs, brochures,
and other printed materials. MICO, Inc. is not responsible for errors, inaccuracies, or inconsistencies that may exist in any catalog, brochure, or other printed materials or any damages
arising from or related to reliance on information in them. Materials and specications for MICO Products set forth in catalogs, brochures, and other printed materials are subject to change
without notice or obligation. Refer to www.mico.com for the most recent versions of our literature. If you have any questions concerning MICO Products, please contact MICO, Inc. All MICO
Products and service are sold and provided subject to the MICO Warranty at www.mico.com in effect on the date of sale or supply.