9-79-7TX / TXH / TXB 180S - 400L (Rev. 4/23/07)TX / TXH / TXB 180S - 400L (Rev. 4/23/07)
2.2. EnsEnsure ture that that the inhe inchiching vang valve ilve is not es not engangagedged
nor sticking.nor sticking.
Hydraulic Checks.Hydraulic Checks. Before checking the torqueBefore checking the torque
converter, transmission, and associated hydraulicconverter, transmission, and associated hydraulic
system for pressures and rate of flow, it is essen-system for pressures and rate of flow, it is essen-
tial that the following preliminary checks be made.tial that the following preliminary checks be made.
NOTE:NOTE: Do not attempt these checkDo not attempt these checks with cold oils with cold oil..
1.1. CheCheck ck the the oil oil levlevel iel in thn the tre transansmismissiosion. n. ThiThiss
should be done with the oil temperatureshould be done with the oil temperature
between +180between +180°°F and +200F and +200°°F (+82F (+82
F toF to
+93+93
F), and the engine operating at idle.F), and the engine operating at idle.
quarter throttle for 30 seconds, let off accelera-quarter throttle for 30 seconds, let off accelera-
tor for 10 seconds.tor for 10 seconds.
5.5. RepRepeat steat step 4. untep 4. until the deil the desirsired coned conververter outer out-t-
let temperature is reached.let temperature is reached.
Full throttle stall speeds for anFull throttle stall speeds for an
excessive length of time will overheat theexcessive length of time will overheat the
converter.converter.
6.6. WheWhen checn checkinking the prg the pressessureures, als, alwayways checs checkk
the charge pump and converter out pressuresthe charge pump and converter out pressures
first.first.
PPrroobblleemm CCaauussee CCoorrrreeccttiioonn
11.. LLow ow cclluuttcchh
pressurepressure
1.1. LoLow ow oil il lelevvelel..
2.2. CluClutch tch prepressussure rre reguegulatlating ing valvalveve
spool is stuck open.spool is stuck open.
3.3. DefDefectective ive chachargirging ng pumpump [p [240 240 --
300 psi (16.6 - 20.7 bar) normal300 psi (16.6 - 20.7 bar) normal
operating pressure].operating pressure].
4.4. BroBroken ken or or worworn cn clutlutch ch shashaft ft oror
piston sealing rings.piston sealing rings.
5.5. CluClutch tch pispiston ton blebleed ved valvalve ste stuckuck
open.open.
1.1. FiFill ll to to propropeper r lelevevel.l.
2.2. CleClean an valvalve ve spospool ol and and houhousinsing.g.
3.3. ReReplplacace ce chahargrgining pg pumump.p.
4.4. RepReplaclace see sealialing ng rinrings ogs or cr clutlutchch
shaft.shaft.
5.5. CleClean ban bleeleed vad valvelves ts thorhorougoughlyhly..
2.2. LoLow cw cononvvererteterr
charging pumpcharging pump
outputoutput
continuedcontinued
1.1. LoLow ow oil il lelevvelel..
2.2. SuSuctctioion scn screreen pen pluluggggeded..
3.3. Air Air leakleaks at s at pumpump inp intaktake hoe hose ase andnd
connections or collapsed hose.connections or collapsed hose.
4.4. DeDefefectctivive che charargiging png pumump.p.
1.1. FiFill ll to to propropeper r lelevevel.l.
2.2. ClCleaean sn sucuctition on scscrereenen..
3.3. TTighighten aten all coll connecnnectiotions or ns or repreplaclacee
hose if hose if necessarynecessary..
4.4. ReReplplacace ce chahargrgining pg pumump.p.
PPrroobblleemm CCaauussee CCoorrrreeccttiioonn
2.2. LoLow cw cononvevertrterer
charging pumpcharging pump
output (Continued)output (Continued)
5.5. CloCloggegged trd transansmismissiosion fin filtelterr..
6.6. DefDefectective ive prepressussure rre reguegulatlatoror..
5.5. RepReplaclace tre transansmismissiosion fin filtelterr..
6.6. RepReplaclace e or or reburebuild ild prepressussurere
regulator.regulator.
3.3. NoNoisisy y coconvnvererteterr
1.1. WoWorn rn cocoupupliling ng gegearars.s.
2.2. WoWorn rn chchargargining g pupumpmp..
3.3. WoWorn orn or dar damamageged bed bearariningsgs..
1.1. ReReplplacace ce coupoupliling gng geaearsrs..
2.2. ReReplplacace ce chahargirging ng pupumpmp..
3.3. A coA complmplete ete disdisassassembembly wly will ill bebe
necessary to determine whichnecessary to determine which
bearing is faulty.bearing is faulty.
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