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WABCO MICO ACV-DMN-LS, Product Explanation, Operating Information, And Service Instructions

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WABCO MICO ACV-DMN-LS Product Explanation, Operating Information, And Service Instructions Download Page 6

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. Orifice (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 fittings

 

  1. Check lines and fittings 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 flow or pressure

 

  2. Check pump

  3. Inoperative system relief valve (valve 

      leaking or has low setting so full flow

 

      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 flow 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 flow

  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. Orifice (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)

Summary of Contents for MICO ACV-DMN-LS

Page 1: ...ng device of the hydraulic system limits pressure in the accumulators The system must be designed to ensure there is sufficient available flow 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 repa...

Page 2: ... o ring 30 from orifice 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...

Page 3: ... 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...

Page 4: ...rt 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 sh...

Page 5: ...URE 2 Figure 2a TABLE 2 Specifications 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 ...

Page 6: ...harging 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 flow 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 leve...

Page 7: ...Form No 81 463 002 Revised 2013 09 05 7 MICO Inc ...

Page 8: ...oducts 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 specifications for MICO Products set forth in catalogs brochures and other printed materials are subject to change...

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