Parker 3Z Series - Troubleshooting Checklist

HY13-1597-01/US
3Z Motor Service Procedure
3ZG Series
Parker Hannin Corporation
Hydraulic Pump & Motor Division
Greeneville, TN 37745 US
6
Trouble Cause Remedy
Oil Leakage
1.Hosettingsloose,wornor
damaged.
Check&replacedamaged
ttingsor“O”Rings.Torqueto
manufacturersspecications
2.Oilsealrings(4)deterioratedby
excessheat.
Replaceoilsealringsby
disassembling3Zunit
3.Specialbolt(1,1A,1Bor
1C)looseoritssealingarea
deterioratedbycorrosion.
(a)Loosenthentightensinglebolt
totorquespecication.
(b)Replacebolt.
4.Internalshaftseal(16)wornor
damaged.
Replaceseal.Disassemblyof3Z
unitnecessary.
Signicant loss of speed
under load
1.Lackofsucientoilsupply (a)Checkforfaultyreliefvalveand
adjustorreplaceasrequired.
(b)Checkforandrepairworn
pump.
(c)Checkforandusecorrectoilfor
temperatureofoperation.
2.Excessiveheat. Locateexcessiveheatsource
(usuallyarestriction)inthesystem
andcorrectthecondition.
Low mechanical eciency or
undue high pressure required to
operate unit
1.Lineblockage Locateblockagesourceandrepair
orreplace.
2.Internalinterference Disassemble3Zunit,identifyand
remedycauseandrepair,replacing
partsasnecessary
3.Lackofpumpingpressure Checkforandrepairwornpump.
4.Excessivebindingorloadingin
systemexternalto3Zunit.
Locatesourceandeliminatecause
CAUTION: If the hydraulic system uid becomes overheated [in excess of 200°F (93.3°C)], seals in the
system can shrink, harden or crack, thus losing their sealing ability.
Troubleshooting Checklist