BECKER Repair and Service Manual VTLF, DTLF
Contents
1. 16 and using two of the screws in the two threaded holes in the endshield press off the right side shield 11 Carefully remove the vanes 7 Loosen the 8 hex head screws 16 from let side shield and remove the side shield and rotor from the housing Install shaft end bolt 77 in end of rotor to protect threads and using large puller pull A side endshield off rotor The unit is now completely disassembled Thoroughly clean the unit in a solvent discarding gaskets filters and dust separator After cleaning in solvent degrease rotor end shields and cylinder with contact cleaner and blow dry with compressed air VTLF DTLF DVTLF REPAIR amp SERVICE MANUAL Page 3 INSPECTION l Inspect cylinder for chatter marks or scoring Inspect side shields If heavily scored replace Note Anytime a major component end shield rotor or cylinder housing is replaced the rotor to cylinder clearance must be reset 3 Inspect rotor for damage REASSEMBLY l Replacement of A side bearing TLF 200 250 Remove the 3 internal hex head screws from bearing cap and remove cap 13 Remove bearing shaft seal and teflon tube seals 25 32 amp 33 Fill new bearing with Amblygon TA 15 2 grease Install new shaft seal and teflon tube seals Place bearing in seat in endshield and replace bearing cap be sure to evenly tighten screws 1A Replacement of A side bearing and setting rotor to endshield clearance TLF 400 500 Remove 42. internal hex had screws from bearing cap and remove cap 13 Remove bearings shaft seal teflon tube seals and removable bearing housing 25 32 amp 33 Remove inner bearing race from rotor shaft Fill new bearings with Amblygon TA 15 2 grease Install new shaft seal and teflon tube seals Place inner bearing race bearing NU2211 906614 onto rotor shaft Place the remaining part of bearing NU2211 906614 into A side endshield Place spring washer on top of outer bearing race Install removable bearing housing into endshield Place second bearing in removable bearing housing without O ring Check that bearing has 0 endplay side clearance in housing with bearing cap installed add shims until there is no endplay Remove bearing and install O ring coat O ring with grease to help bearing slide into housing Reinstall bearing cap 13 Place selection of shims 27 28 amp 29 on rotor and press endshield onto rotor Measure clearance between rotor and endshield Add or subtract shims to obtain proper clearance as listed in Table 2 Place selection of shims 27 28 amp 29 on rotor and press endshield onto rotor Measure clearance between rotor and endshield Add or subtract shims to obtain proper clearance as listed in Table 2 VTLF DTLF DVTLF REPAIR amp SERVICE MANUAL Page 4 2 Replacement of B side bearing Remove the 3 internal hex head screws from bearing cap and remove cap 15 amp 14 Remove b
3. N Sy oN _ SHIMS TLF 400 500 only NACSA 2 RING TA JS NAN UAN N 3 ARING TLF 400 500 only te es NN 4 SHIMS TLF 400 500 only ee 5 C C eT 500 only oee 6 BEARING NSI o 7 NAAF T SEAL 9 REMOVABLE BEARING CAP pra NN CTLF 400 500 onl RN 0 A SIDE ENDSHIE Sz tga a re ce ge O owe ca He L y x J Va ye Z QQ 7 ee
4. VTLE DTLE DVTLF REPAIR amp SERVICE MANUAL Page BECKER Repair and Service Manual VTLF DTLF DVTLF Series This manual covers repairs and service for the following Becker models VTLF200 VTLF 250 DTLF 250 DVTLF 250 VTLF400 VTLF 500 and DTLF 500 This manual is to be used in conjunction with the current parts list for the appropriate model Reference numbers used in this manual are position numbers as shown on the parts list The sealing compounds and greases referred to in this manual are those recommended by the pump manufacturer These are available through your Becker Pumps representative VTLF DTLF DVTLF REPAIR amp SERVICE MANUAL Page 2 DISASSEMBLY Remove 4 nuts 197 from the motor flange 187 and remove the motor and flange Remove the shaft end screw from the rotor shaft 77 Remove the coupling with fan 69 Remove the key 10 Loosen and remove the 4 inside hex head screws 67 with spring washers from connection flange 61 Remove the filter covers 120 amp 95 and remove the filter cartridge s 118 Remove filter housings 101 amp 81 Remove the protective hood 41 Remove grease conduits 35 from both endshields Roll pump onto side so that the discharge port is facing downward Remove SK filter housing 513 Remove ring screw 58 Place housing horizontally on workbench so that the hole for the ring bolt 58 is on the bottom Unscrew the 8 hex head screws
5. ct rubber coupling disc and pins Replace if necessary and realign Seized bearings Remove endshields and inspect bearings Replace if necessary Reshim bearings to maintain proper clearance VTLF DTLF DVTLF REPAIR amp SERVICE MANUAL Page 9 Possible Cause Unit runs rough and Oil in cylinder Remove endshields and inspect cannot be rotated cylinder Clean oil and replace manually contd vanes Clean unit thoroughly Inspect piping determine source of oil and eliminate Locked rotor Remove endshields and inspect cylinder Remove contamination Pump overheats Cooling ducts blocked Clean cooling ducts Cooling fan broken Replace fan REPAIR TOLERANCES VTLF DTLF DVTLF REPAIR amp SERVICE MANUAL Page 10 Table 1 Pump Type Rotor Length Cylinder Length Cylinder Inside Diameter VTLF 250 354 29 354 26 354 964 355 00 175 00 175 04 VTLF 500 439 00 439 02 439 96 440 00 230 00 230 046 Pump Type Vane Length Vane Width Rotor to End Rotor to Shield C Cylinder D Min New VTLF 250 354 35 354 30 41 0 65 0 0 07 0 10 0 14 0 16 VTLF 500 219 55 219 525 53 0 88 0 0 15 0 20 0 20 0 25 Note All dimensions are in Millimeters ay Dil Pie FILE RR Ey OO 0 0 2mm i POS 29 30 T _ 2 Yy aaa ZZ eee J SG cS I ocn N A
6. earing outer race with rollers and cage shaft seal and teflon tube seals 24 32 amp 33 Install new shaft seal and teflon tube seals Fill new roller bearing half full with Amblygon grease and place in bearing seat in end shield Replace bearing cap and be sure to evenly tighten internal hex head screws Remove shaft end screw and grease ring 22 amp 21 SETTING ROTOR TO A SIDE ENDSHIELD CLEARANCE TLF 200 250 With new bearings and shaft seals in A side endshield place shim stack of 0 15mm to 0 20mm on A side of rotor shaft Press endshield onto shaft and measure clearance between endshield and rotor See Table 2 for proper clearances Add or subtract shims to obtain proper clearance The following steps are only required if a major component of the pump has been replaced endshield rotor or pump housing Setting Rotor to Cylinder Clearance TLF 200 250 only the following procedure is not needed on TLF 400 500 l Place housing on work bench so that the minimum clearance area the area of minimum rotor to cylinder clearance when the pump is fully assembled is positioned at the bottom Remove locating pegs 17 from both endshields Mark endshields for suitable location of new holes for locating pegs Set rotor to endshield clearance using new bearings and shaft seals Insert gauge tape feeler gauge shim stock paper or non reinforced tape of proper thickness and approximately the same width as a rotor segm
7. ent area between two vane slots into the cylinder Make sure the rotor is supported by a single thickness of gauge tape above the cylinder Place rotor and A side endshield into housing making sure that rotor segment not a vane slot is resting on the gauge tape Install A side endshield bolts but do not fully tighten Install B side endshield bolts but do not fully tighten Using moderate pressure press down on endshield and center endshield bolts in holes VTLF DTLF DVTLF REPAIR amp SERVICE MANUAL Page 5 10 11 x 13 14 15 16 17 18 On 4 5mm drill bit mark drilling depth using peg as guide Drill holes in endshield to proper depth taking care to keep drill perpendicular to endshield Repeat on opposite end Remove endshields and redrill holes in body with 4 9mm drill bit Using 5mm H7 reamer ream holes in endshields Ream holes in body using 5mm carbide reamer Install locating pegs in endshields and remove gauge tape from rotor and cylinder Reinstall A side endshield and rotor Install vanes and B side endshield Rotor to cylinder clearance is now reset continue reassembling unit in normal manner REASSEMBLY CONTINUED Place housing on work bench so that area of minimum clearance is on the bottom the area of minimum clearance when pump is fully assembled and inlet port is on the left With housing positioned as described above slide rotor and A side endshield assembly into housing mak
8. ing sure that inlet port is on the left when housing is viewed from the A side endshield Install vanes and B side endshield Install endshields bolts in both endshields and fully tighten Roll pump assembly onto exhaust port side and install inlet filter housing 101 with new gasket Install new inlet filter 118 and filter cover 120 with new gasket Install SK filter housing 512 with new gasket Replace SK filters 4507 and cover gasket 511 Install grease conduits 35 on both endshields Install connection flange 61 and roll pump assembly onto feet VTLF DTLF DVTLF REPAIR amp SERVICE MANUAL Page 6 10 11 12 13 Install discharge filter housing 81 with new gasket Install dust separator if unit is equipped with and discharge filter cover 95 Replace protective hood 41 Replace shaft key 10 and fan with coupling 69 Tighten shaft end bolt 77 Check motor coupling distance Reinstall motor Setting Motor Coupling Distance Place straight edge across the machined surface of the motor connection flange 61 and measure to the outer ring of the pump coupling Subtract 2mm 080 from measurement obtained in step 1 Place straight edge across motor coupling 164 and push coupling on to motor shaft far enough to obtain the distance calculated in step 2 from outer ring of coupling to mating surface of motor connection flange 61 Apply blue lock tite Lock Tite 242 to m
9. ons Replace rubber hoses Check voltage and amperage to motor Inspect motor coupling halves Check that the pump shaft turns freely Clean and open all ports Inspect gaskets for breakage or disintegration Replace if necessary VTLF DTLF DVTLF REPAIR amp SERVICE MANUAL Page 8 Possible Cause Unit lacks sufficient Line losses too high Piping diameter too small replace vacuum or compressed with large diameter air contd Carbon dust separator Inspect clean or replace clogged Unit is operating at an Contact the factory for assistance elevated altitude Performance may be reduced when operating above sea level Check for clogged filter elements replace if necessary Defective motor Test motor and replace if necessary Undersized circuit Replace with correctly sized breaker breaker Heaters too small Replace with correctly sized heaters Low motor voltage Check at motor terminals Contact electric service provider Ambient temperature Reduce ambient temperature to too high below 104 F Stuck rotor Disassemble pump to determine reason Replace all necessary parts Motor breakers trip constantly Clogged carbon dust Clean or replace dust separator separator back pressure too high Unit runs rough cannot Broken rotor vane Disassemble unit and replace vane be rotated manually Check cylinder for wear Worn coupling disc Remove motor and inspe
10. otor coupling set screw 170 and tighten Attach motor to pump Unit Testing Check that motor is wired for correct voltage and frequency Check motor for correct direction of rotation Operate pump under no load for approximately 20 minutes Place vacuum gauge or gate valve on inlet port on combined units also install pressure gauge on discharge port Adjust pump relief valve s so that pump cannot exceed rated vacuum or pressure Check motor amperage As unit warms up amps will go down and vacuum and pressure may go up so it may be necessary to reset valves When everything is operating properly continue to test unit for 60 minutes VTLE DTLE DVTLF REPAIR amp SERVICE MANUAL Page 7 TROUBLE SHOOTING Unit lacks sufficient vacuum or compressed alr Possible Cause Clogged filters Stuck rotor vanes Pressure or vacuum relief valves need adjusting Leaks or restrictions 1n piping Insufficient pump speed RPM Clogged ports Defective gaskets Replace gaskets Clean or change filters add a higher capacity external filter in series with the existing internal filters Disassemble unit and clean all oil traces from internal parts Replace carbon vanes since they become hygroscopic when exposed to oil Check for oil contamination in the suction line Recalibrate valves Open pipe connections and examine for internal contamination or build up Tighten all piping connecti
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