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TST-019 MRTALPCH CHANNEL 

– Rev. 2016-310 

Page 16 of 20 

 

6)  Vacuum line sections and included fittings may be tested by moving up each line (toward the 

vacuum generating system) to the next fitting, removing the hose and plugging it at the fitting, 
or by installing the ball valve assembly (with the gauge end toward

s the section that the lifter’s 

gauge has been separated from) into the line. 

7)  Each circuit (red and green) has one vacuum pad connected by a quick connect, shown in 

FIGURE 22 

below.  Disconnect the quick connect and repeat the vacuum test. 

 

If, with the quick connect disconnected, the vacuum level, as shown on the lifter’s vacuum 
gauge, still indicates a leak (vacuum level drops), proceed to step 10. 

 

If, with the quick connect disconnected, the vacuum level, as shown on the lifter’s vacuum 
gauge, now holds steady and does not leak, the indication is that the leak is located in the 
section that was removed.  This would be the pad fitting, hose, the quick connect plug 
assembly, or that the quick connect leaks when connected.  Proceed as follows. 

8)  Remove the hose from the barbed fitting of 

the male quick connect plug and cap off the 
barbed fitting.  Connect the male plug to the 
female quick connect coupler. See 

FIGURE 23

Repeat the vacuum test. 

  If the leak resumes, examine the threads 

of the barbed fitting for indication of 
cracks.  If the fitting itself does not appear 
damaged, replace the quick connect.  
Note, the O-ring that seals the male 
portion of the quick connect to the female 
half when they are attached is part of the 
female coupler, due to this it is recommended that both the male and female quick connect 
be replaced. 

  If the vacuum level, 

as shown on the lifter’s vacuum gauge, continues to hold steady and 

does not drop, the indication is that the quick connect does not leak when connected.  
Continue to next step. 

FIGURE 22 

 

FIGURE 23 

 

Содержание MRTALPCH611LDC

Страница 1: ...16 310 LEAK TEST PROCEDURE MRTALPCH611LDC REMOTE READY LIFTERS W 3 BUTTON CONTROL APPLICABLE TO LIFTERS WITH SERIAL NUMBERS GREATER THAN 20100742 TESTING AND MAINTENANCE MUST BE DONE BY A QUALIFIED PE...

Страница 2: ...TST 019 MRTALPCH CHANNEL Rev 2016 310...

Страница 3: ...ch in the off position However due to the unique design of this vacuum system the situation may arise where with the power turned on the vacuum pump may cycle repeatedly but the vacuum level as shown...

Страница 4: ...pproximately 1 8 1 4 3 6 mm off the end of the hose before reinstalling it on the fitting in order to remove damaged hose ends For push in fittings the hose end must be cut square and straight to seal...

Страница 5: ...ad system any leakage will appear to be faster than seen in the overall test due to the reduced system volume 1 Remove the 4 screws 1A that attach the valve cover 1B to the channel Note there are no c...

Страница 6: ...this circuit red or blue green does not leak between the check valve and the filter If during the overall test of the lifter a leak was indicated in both circuits red and blue green remove the ball va...

Страница 7: ...e turned perpendicular to the valve switch the power on and activate the vacuum generating system by pressing the apply push button 3 Switch the power to off and observe the vacuum gauge of the ball v...

Страница 8: ...ose the ball valve turn handle perpendicular to the valve switch the power to off and observe the vacuum gauge of the ball valve to determine the area of the leak If the vacuum level on the ball valve...

Страница 9: ...vacuum gauge the indication is that a leak exists between the vacuum pump and the check valve s If either the solenoid valve that seals off the vacuum pump to the vacuum system the vacuum switch or t...

Страница 10: ...s shown on the ball valve s vacuum gauge starts and continues to drop the indication is that the hose connection to the vacuum tanks is the cause of the leak Proceed to step 30 15 Remove the ball valv...

Страница 11: ...nect the 5 32 O D hose 10B from the control box 10C that connects to the solenoid assembly Note this hose may be blue or black 23 Attach the end of the ball valve with the vacuum gauge to the hose rem...

Страница 12: ...2 27 With the ball valve in the open position handle in line with the valve switch the power on and activate the vacuum generating system by pressing the apply push button 28 Close the ball valve turn...

Страница 13: ...nd fittings 31 The components involved will be the hose running from the 45 fitting of the pump solenoid 14A to the Y fitting 14B and the green and red hoses 14C running from the Y fitting to their re...

Страница 14: ...amage the single barb of the fitting 36 Using an additional piece of hose connect the end of the ball valve with the vacuum gauge to the Y fitting Connect the other end of the ball valve to the hose c...

Страница 15: ...ge of the ball valve If the vacuum level as shown on the ball valve s vacuum gauge starts and continues to drop the indication is that the Y fitting leaks Replace the Y fitting Reconnect the hoses and...

Страница 16: ...ere are no indications of damage to the threads of the check valve replace the push in fitting of the vacuum tank 20A that connects to the 3 8 O D hose the red tank connection is shown in FIGURE 20 If...

Страница 17: ...shown in bottom views Note If only one set of pads green or red circuit is capped off the lifter will need to be attached to a clean smooth surface for the remaining section to seal during testing 4 W...

Страница 18: ...s not leak the indication is that the leak is located in the section that was removed This would be the pad fitting hose the quick connect plug assembly or that the quick connect leaks when connected...

Страница 19: ...the male quick connect or the pad fitting It will exist between the quick connect and the filter connection of the circuit being tested 11 Test the quick connect by itself when disconnected Remove the...

Страница 20: ...connection The next step would be to move to the next fitting in the pad line remove the hose leading from it to the quick connect cap off the fitting and repeat the test If the leak continues continu...

Страница 21: ...ball valve is to install it in a line so the lifter s vacuum gauge provides a reading for one section of the circuit being tested and the ball valve s vacuum gauge provides a reading for the remainder...

Страница 22: ...ed fitting and hose do not leak In the same respect if the ball valve s vacuum gauge held this would verify that the section between it and the filter connection do not leak 15 Continue testing using...

Страница 23: ...ed during testing always apply thread sealant Teflon tape or similar product to the male threads prior to reassembly in order to avoid vacuum leaks For plastic fittings use only Teflon tape liquid sea...

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