MI18-21
Service Bulletin Details
Public Details for: MI18-21
This maintenance information presents information about the bitzer a/c compressor oil change interval and reminds technicians to clean the oil filter/strainer and the magnetic drain plug.
- 2018 - 2017 - 2016 - 2015 - 2014 - 2013 - 2012 -
Models from 2018
2018 PREVOST H3-41 |
2018 PREVOST H3-45 |
2018 PREVOST H3-45 VIP |
2018 PREVOST X3 |
2018 PREVOST X3VIP |
Models from 2017
2017 PREVOST H3-41 |
2017 PREVOST H3-45 |
2017 PREVOST H3-VIP |
2017 PREVOST X3 |
2017 PREVOST X3VIP |
Models from 2016
2016 PREVOST H3-41 |
2016 PREVOST H3-45 |
2016 PREVOST H3-VIP |
2016 PREVOST X3 |
2016 PREVOST X3VIP |
Models from 2015
2015 PREVOST H3-41 |
2015 PREVOST H3-45 |
2015 PREVOST H3-VIP |
2015 PREVOST X3 |
2015 PREVOST X3VIP |
Models from 2014
2014 PREVOST H3-41 |
2014 PREVOST H3-45 |
2014 PREVOST H3-VIP |
2014 PREVOST X3 |
2014 PREVOST X3VIP |
Models from 2013
2013 PREVOST H3-41 |
2013 PREVOST H3-45 |
2013 PREVOST H3-VIP |
2013 PREVOST WE |
2013 PREVOST X3 |
2013 PREVOST X3-VIP |
Models from 2012
2012 PREVOST H3-41 |
2012 PREVOST H3-45 |
2012 PREVOST H3-VIP |
2012 PREVOST WE |
2012 PREVOST X3 |
2012 PREVOST X3-VIP |
MAINTENANCE INFORMATION DATE : SUBJECT : MI18-21 May 2018 SECTION : 22 HVAC BITZER A/C COMPRESSOR OIL CHANGE INTERVALS IMPORTANT NOTICE This modification is recommended by Prevost to increase your vehicle's performance. Note that no reimbursement will be awarded for carrying out this modification. APPLICATION Model VIN ALL VEHICLES EQUIPPED WITH THE BITZER A/C COMPRESSOR DESCRIPTION Change the Bitzer A/C compressor oil according to the following maintenance schedule extract. At the same time, clean the oil filter/strainer and the magnetic drain plug. BITZER COMPRESSOR MAINTENANCE SCHEDULE DESCRIPTION INTERVAL Drain the shaft seal oil collection tube 1 month Check the oil color and the oil level, top up as needed. Change the oil if it is dark 12 months Change the oil, clean the filter/strainer and the magnetic drain plug 36 months For complete information on Bitzer A/C compressor maintenance, installation, torque chart, approved oils, refer to the following Bitzer manuals found on your Technical Publications USB flash drive and on the Prevost Technical Publications web site. Bitzer kw-540-1 Maintenance Instruction Bitzer kb-540-3 Operating Instructions Bitzer kw-541-2 Exchanging Shaft Seal Bitzer kw-555-3 Tightening Torques Bitzer kt-510-5 Tech Info oils Writer: ELMI18-21 Page 2 / 4 DANGER Park vehicle safely, apply parking brake, stop engine. Prior to working on the vehicle, set the ignition switch to the OFF position and trip the main circuit breakers equipped with a trip button. On Commuter type vehicles, set the battery master switch (master cut-out) to the OFF position. SHAFT SEAL OIL COLLECTION TUBE DRAIN The shaft seal oil collection tube (figure 1) collects oil which seeps past the shaft seal. Remove the tube plug and drain the oil into a container for disposal. Put the cap back on the tube and place the tube into the clip bracket. FIGURE 1: SHAFT SEAL OIL COLLECTION TUBE OIL COLOR AND LEVEL CHECK 1. Run the compressor for at least 15 minutes. 2. Check the oil level during operation. Oil level should be between ¼ and ¾ of sight glass height. 3. Check for discoloration of the oil. It should be clear and light in color. Dark, cloudy and contaminated oil must be changed. Diagnose the problem. The oil level is expected to remain the same over time except if there is a loss of refrigerant. Adding oil must be done by taking the same precautions as when changing oil in order not to introduce the moisture content of the ambient air in the air conditioning system. COMPRESSOR OIL CHANGE 1. Check the oil level first and note down. 2. Connect the refrigerant recovery station to the service connections of the shut-off valves. 3. Isolate the compressor from the system. To do so, frontseat the compressor shut-off valves (Respect the prescribed torques. Refer to figure 2 & figure 3 for proper torque values). 4. Extract the refrigerant using the recovery station until ambient pressure is reached. Take note of the quantity removed. Writer: EL MI18-21 Page 3 / 4 5. Remove the magnetic drain plug (figure 5). 2- Compressor shut-off valve frontseat position. Torque: 21 lb-ft (28 Nm) max. 4- Remote pressure transducer connection. Always under compressor pressure. FIGURE 2: COMPRESSOR SHUT-OFF VALVE IN FRONT SEATED POSITION 2- Compressor shut-off valve backseat position. Torque: 12 lb-ft (16 Nm) max. 3- Service port 7/16”-20 UNF. Isolated when stem is completely out (fully backseated position). Front seat 2 turns for service gauge reading. Torque: 7.5 lbf-ft (10 Nm) max. FIGURE 3: COMPRESSOR SHUT-OFF VALVE BACKSEATED POSITION (NORMAL OPERATING POSITION) FIGURE 4 A: OIL FILL PLUG (torque 15-17 lb-ft (20-23 Nm) B: SIGHT GLASS FIGURE 5: CUTAWAY VIEW SHOWING OIL FILTER/STRAINER AND MAGNETIC DRAIN PLUG. Torque 37-52 lb-ft (50-71 Nm) 6. Drain the oil into a container. Measure the quantity of oil removed. Writer: EL MI18-21 Page 4 / 4 7. Extract and clean the oil filter/strainer. Reinstall once done. 8. Clean the magnetic drain plug and reinstall (refer to figure 5 for torque value). 9. Through the oil filling port, add the same amount of fresh oil. More oil should be added if the oil level was too low when checked at the beginning (refer to figure 4 for oil filling port plug torque value). 10. Evacuate the compressor to 500 microns. 11. Charge the system with new refrigerant. Charge with the same quantity as recovered previously. Bitzer A/C compressor – oil specification Oil type : Polyolester ISO68 for R134a Such as : • Bitzer BSE55 (POE) • Castrol Icematic SW 68 • Mobil EAL Arctic 68 • Shell S4 FR-F 68, Clavus R68 For more details on oils, see Bitzer kt-510-5 Tech Info Oils available on the Prevost Technical Publications web site. PARTS / WASTE DISPOSAL Discard according to applicable environmental regulations (Municipal/State[Prov.]/ Federal) Access all our Service Bulletins on http://techpub.prevostcar.com/en/ Or scan the QR-Code with your smart phone . Are you a Vehicle owner? E-mail us at [email protected] and type “ADD” in the subject to receive warranty bulletins applicable to your vehicle(s) by e-mail. Writer: EL