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Gradall LOED 534A, Руководство по обслуживанию

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MAINTENANCE PROCEDURES - PLUNGERS

SEAL REPLACEMENT

A one piece molded combination wiper and seal is used at each end of the plunger. The seals are positioned
with a seal ring and retained by seal plates. To replace seal at tang end of plunger, remove screws and seal
plate from housing. Carefully remove seal and seal ring from housing. Seal groove must be smooth and com-
pletely free of dirt, pits, and metal particles. Examine lip of new seal for damage or mars. Replace seal ring
and press firmly in place with a blunt tool (seal ring must fit in molded recess of seal to seat properly).
R e p l a c e   s e a l   p l a t e   a n d   r o u n d   h e a d   s c r e w s .

To service seal at cap end of plunger, remove plunger cap from housing. Insert a pin through hole
of tang and through tang hole of an adjacent plunger to prevent plunger from turning. Remove cap screw
from end of plunger. Remove spring seats, plunger spring and seal plate from end of plunger. Remove seal
and seal ring from housing. Seal grooves must be smooth and completely free of dirt, pits, and metal par-
ticles. Examine lip of new seal for damage or mars. Replace seal ring and press seal firmly in place with a
blunt tool (seal ring must fit in molded recess of seal to seat properly). Assemble seal plate, inner spring
s e a t ,   s p r i n g   a n d   o u t e r   s p r i n g   s e a t   t o   p l u n g e r   w i t h   c a p   s c r e w.  A s s e m h l e   p l u n g e r   c a p   t o   h o u s i n g .

DISASSEMBLY

NOTE: DURING DISASSEMBLY PLUNGERS MUST BE TAGGED TO ASSURE REASSEMBLY TO THE SAME BORE.

Remove round head screws, seal plate, seal and seal ring from tang end of housing. Remove plunger cap.
Insert pin through hole of an adjacent plunger to prevent plunger from turn-
ing. Remove cap screw from end of plunger. Remove spring seats, plunger spring and seal plate. Carefully
w i t h d r a w   p l u n g e r   f r o m   h o u s i n g ,   t a n g   e n d   f i r s t .   R e m o v e   s e a l   a n d   s e a l   r i n g .

INSPECTION AND REPAIR

Clean all parts with solvent and dry with compressed air. Examine wiper seal for cuts, nicks, deterioration
o r   h a r d e n i n g .   R e p l a c e   i f   n e c e s s a r y.   R e p l a c e   p l u n g e r   s p r i n g   i f   b r o k e n   o r   d i s t o r t e d .

ASSEMBLY

Thoroughly clean sealing surfaces of housing. Install seal ring at tang end and press seal firmly in place with
a blunt tool (seal ring must fit in molded recess of seal to seat properly). Replace seal plate. Coat the seal
wiper lips with clean oil. Insert plunger hito housing, tang end first from cap end. Work plunger carefully
through seal. Assemble seal ring and seal to cap end of plunger. Press seal firmly in place with a blunt
tool (seal ring must fit in molded recess of seal to seat properly). Replace seal plate, inner spring seat, spring
and outer spring seat to plunger with cap screw. Insert pin through hole of tang and through tang hole of an
adjacent plunger to prevent plunger from turning; tighten cap screw. Assemble plunger cap to housing.

 Double Acting - Spring Centered Plunger (Hydraulically Balanced)

37

FIGURE 33

Содержание LOED 534A

Страница 1: ...trademark for hudraulic excavators built by The Gradall Co THE COMPANY 406 MILL AVENUE S W NEW PHILADELPHIA OHIO 44663 216 339 2211 This manual describes the LOED Handler as origionally designed and...

Страница 2: ...ir Power master cylinder repair Planetary hub repair Hydraulic pressure adjustment Hydraulic cylinder repair Valve repair Pump and motor troubleshooting Pump repair Rear motor repair Front motor repai...

Страница 3: ...you avoid injury and damage to the equipment These notes are not intended to cover all eventualities it would be impossible to anticipate and evaluate all possible applications and methods of operati...

Страница 4: ...ment parts can be ordered from your nearest LOED Handler distributor Always furnish the machine model and serial number as well as a complete description of the part and the part number This enables t...

Страница 5: ...MODEL 534 6 000 Capacity 4 FIGURE 1...

Страница 6: ...NCLATURE 5 FORKS FORKFRAME BOOMHEAD TILTCYLINDER THREESECTIONBOOM LIFTCYLINDER COMPENSATINGCYLINDER HYDRAULICRESERVOIR FUELTANK PLANETARYHUB CROWDCYLINDER LEVELCYLINDER 1 2 3 4 5 6 7 8 9 10 11 12 FIGU...

Страница 7: ...of section Pull chain out back of boom REASSEMBLY Note Replace chain ends whenever chain is replaced Use fish wire to pull new chain from back of boom to ears in bottom of section one Lay chain over...

Страница 8: ...rongback Hose Retainer Nuts Extension Chain Nuts Section One Section Two Take up Beam Take up Beam Bracket Section Three Retraction Chain Section Three Chain Ears Extension Chain 1 2 3 4 5 6 7 8 9 10...

Страница 9: ...SSEMBLY Note Replace chain ends whenever chain is replaced Pin extension chain to ears at back of section three Lay chain and hoses in hose guide pan Carefully slide take up beam and guide pan into bo...

Страница 10: ...Retraction Chain Retraction Chain Ears Section 1 Section Three Retraction Chain Ears Section 3 9 Guide Pan Strongback Hose Retainer Nuts Extension Chain Nuts Section One 1 2 3 4 5 6 7 8 9 FIGURE 4...

Страница 11: ...t back of section three Carefully pull new hose along guide pan and around reel while pulling old hose out back of boom Connect new hose to tube line at rear of section three Reassemble hose retainer...

Страница 12: ...o p A d j u s t l i n k a g e C s o m o v e m e n t o f l e v e r f r o m 1 2 a n d 3 4 m o v e s s p o o l f r o m f u l l d o w n t o f u l l u p A d j u s t l i n k a g e D s o s p o o l m o v e s...

Страница 13: ...e v e r s e l e v e r i n f o r w a r d d e p r e s s b r a k e p e d a l u n t i l a l l s l o p i s t a k e n u p i n t h e b r a k e l i n k a g e A t t h a t p o i n t t h e s p o o l i n t h e f...

Страница 14: ...a piece of wire through the stem to make sure it Is not plugged IMPORTANT TIREandRIMSERVICINGSAFETY INSPECTION Clean rims and repaint to stop detrimen tal effects of corrosion and facilitate checking...

Страница 15: ...D RIM ON VEHICLE Don t try to drive an assembled or par tially assembled tire and rim over a cast spoke wheel by hammering Stop deflate and examine to determine the reason for the improper fit Look fo...

Страница 16: ...is not seated DO NOT INFLATE UNTILLOCK RING IS PROPERLY SEATEDAND LOCKED KW KB KWX TYPE RIMS Incorrect KW KB and KWX type rims have unique configurations that deserve special mention Make sure your as...

Страница 17: ...d Broken Rims and Components Replace Distorted Rims Components Distorted rims and components will not properly lock together They should be replaced This hazard besides making the tire rim assembly un...

Страница 18: ...bases which almost always create an unsafe operating condition The pictures contained herein are intended only to depict some examples of incorrect procedures They are not intended to show all incorre...

Страница 19: ...from the power plate 18 by introducing low pressure air 15 psi into the hydraulic inlet Make sure piston is directed away from the operator Remove O rings 15 17 and teflon back up rings 14 16 from the...

Страница 20: ...19 FIGURE 19...

Страница 21: ...T SECTION Refer to Figures 20 21 1 1 Remove Brake Valve from vehicle by dis connecting necessary fluid lines dis connecting push rod and removing mounting bolts Drain fluid from assembly 1 2 Separate...

Страница 22: ...058 Refer to Figures 20 22 Clean all parts thoroughly before assembling Install seat item l3 and check valve item 12 in bore of housing Attach retainer item 10 to small end of spring item 11 Install...

Страница 23: ...e piston item 31 from piston item 25 Remove spring item 30 from piston item 25 Remove v cup seals items 24 26 and back up rings items 23 27 from piston item 25 Remove piston item 29 from piston item 2...

Страница 24: ...a l l s p r i n g i t e m 3 0 o n p i s t o n i t e m 2 5 I n s t a l l p i s t o n i t e m 3 1 o v e r s p r i n g i t e m 3 0 a n d p i s t o n i t e m 2 5 I n s t a l l r e t a i n i n g r i n g i...

Страница 25: ...on a flat surface with large gears up Find marked punch marked teeth on the large gears Rotate until the marks are in a straight up position See Figure Place ring gear 4 over large gears of carrier s...

Страница 26: ...is a loose fit and should not be pressed I n v e r t t h e p a r t i a l a s s e m b l y o f h u b s p i n d l e 1 A 1 B 1 C 1 D 1 E a n d 1 G D o n o t l e t s p i n d l e 1 A s l i p f r o m h u b 1...

Страница 27: ...s i d e a n d c a r r i e r 3 A w a l l N O T E T h e h o l e i n p l a n e t s h a f t 3 E m u s t l i n e u p w i t h p i n h o l e i n c a r r i e r 3 A w a l l T h e c h a m f e r e d s i d e o f...

Страница 28: ...CARRIER SUBASSEMBLY FRONT 24 TO 1 REAR 35 TO 1 27 FIGURE 24...

Страница 29: ...r e a d 2 5 0 0 p s i TILTCIRCUITPORTRELIEFS C o n n e c t a 5 0 0 0 p s i g a u g e t o t e s t p o i n t 5 Rotate the forks full down A t 1 2 t h r o t t l e r a i s e t h e b o o m G a u g e s h o...

Страница 30: ...a t e t h r e a d s w i t h h y d r a u l i c o i l a n d t o r q u e n u t t o s p e c i f i c a t i o n 1 Nut 150 175 lb ft 1 1 2 600 650 1 3 4 950 1000 2 1 2 1800 2000 L u b r i c a t e p i s t o...

Страница 31: ...WEARRING O RING PISTONSEAL NUT CYLINDERBARREL BUSHING CYLINDERROD 1 2 3 4 5 6 7 WIPERRING RODSEAL RODBEARING BACKUPRING O RING O RING PISTON 8 9 10 11 12 13 14 31 FIGURE 26...

Страница 32: ...Thoroughly flush valve housing grease detents and other sliding parts and reassemble valve During assembly do not damage plunger seals If a new plunger is required refit new plunger to the respective...

Страница 33: ...VALVE SERVICE INFORMATION Check valve malfunctioning is usually the result of foreign matter lodging between the seat and the poppet Examine seat for dirt or metal particles Check seating face for nic...

Страница 34: ...CTION AND REPAIR Clean parts with solvent and blow dry with compressed air Examine poppet and poppet seat for nicks or scratches Minor nicks or scratches can be removed by lapping poppet and seat with...

Страница 35: ...nut and install acorn nut Retest to check pressure setting NOTE THE ABOVE SETTING WILL PRODUCE A RELATIVELY CONSTANT RELIEF VALVE SETTING ACROSS FULL ENGINE RPM To set pressure on the Service Port Rel...

Страница 36: ...if grooves or ridges are present the valve must be returned to Husco for re machining All seats and seating surfaces should be smooth and free of nicks scratches or grooves Examine O rings and back u...

Страница 37: ...plunger cap to housing DISASSEMBLY NOTE DURING DISASSEMBLY PLUNGERS MUST BE TAGGED TO ASSURE REASSEMBLY TO THE SAME BORE Remove round head screws seal plate seal and seal ring from tang end of housing...

Страница 38: ...corn nut lock nut and the two washers from the adjustment screw Remove all O rings and spiral back up rings INSPECTION AND REPAIR NOTE THE MOST COMMON CAUSE OF RELIEF VALVE FAILURE IS DAMAGED OR FATIG...

Страница 39: ...ffer ential area between diameters A and B main poppet D and check valve poppet K are tightly seated See Fig 35 Step 3 The loss of oil behind piston C effected by the opening of pilot poppet E causes...

Страница 40: ...sive wear or dam age occurs to the plunger or bore return valve to factory for rebuilding or replacement NOTE Remove valve from machinery and thoroughly clean the exterior before attempting any disass...

Страница 41: ...SECTION II TROUBLE SHOOTING 41 FIGURE 40...

Страница 42: ...ntinued Step 13 Step 14 Step 15 Step 16 Step 17 Step 18 Step 19 42 ring groove is clean and has not been damaged in any way Insert plunger No 4 through the detent sleeve until the rear of the plunger...

Страница 43: ...RSEVALVE Reassembly Take the plunger No 4 out of the vise and dip the tang end in oil Now gently insert it into the plunger bore of the housing No 11 being careful not to move the detent sleeve No 9 I...

Страница 44: ...TROUBLESHOOTING GUIDE FOR GEAR TYPE HYDRAULIC PUMPS 44 FIGURE 43...

Страница 45: ...pump and causing leakage at the port connectors Figure 45 HYDRAULICPUMP Disassembly Remove nuts 23 and washers from studs Remove pump from vise and set pump on bench with shaft end up Coat the shaft e...

Страница 46: ...retainer 13 o ring 12 back up ring 14 and iso lation plate 10 Figure 48 Grasp the drive shaft extension and lift upward to dislodge the pressure plate Grasp the pressure plate between thumb and forefi...

Страница 47: ...e ring retainer 13 o ring 12 back up ring 14 and isolation plate 10 Remove body 1 Using wood mallet or plastic hammer tap the sides of the body With the other hand lift body off dowel pins Remove spli...

Страница 48: ...ection examine the two isolation plates 10 and 11 You will find that plate 11 has rounded edges Install this plate on the suction side of the body with the rounded edges down Figure 53 Assembly Instal...

Страница 49: ...s square edges on the suction port side Install back up ring 14 o ring 12 and retainer 13 on the discharge side Figure 58 Install o ring 25 in the bearing plate 3 on the side which has the bearings ex...

Страница 50: ...TIMING SKETCH FRONT DRIVE GEAR TO BE TIMED WITH REAR DRIVE GEAR BY LINING UP A TOOTH ON REAR DRIVE WITH VALLEY OF TWO TEETH ON FRONT DRIVE 50 FIGURE 60...

Страница 51: ...cing you and with gear bore up To assemble this pumping section repeat Steps 23 through 31 using gears 7 and 5 Install dowels 20 in body 1 Figure 62 Install and tighten stud bolts Figure 63 If a new f...

Страница 52: ...ides down over the shafts Refer to Step 32 and use the same precautions in the final assembly of the flange plate Figure 65 Install washers 26 and nuts 23 Tighten two opposite nuts Use a 10 wrench to...

Страница 53: ...king care that it is centered over the seal Fig 71 Seal Replacement Stand pump on end and loosen all fasteners holding flange to body Remove flange Lay the flange on a smooth clean surface and remove...

Страница 54: ...same manner Take care not to damage the bores After the old bearings have been removed wash all of the parts thoroughly in solvent Press in the new body bearings They should protrude above the surface...

Страница 55: ...REAR DRIVE MOTOR 55 FIGURE 72...

Страница 56: ...PARTS IDENTIFICATION 56 FIGURE 73...

Страница 57: ...re originally Fig 74 Securely fasten the motor in a machinist s vise shaft up Use a cream block of wood between each flat side of the motor and the vise jaws This will protect the machined surfaces fr...

Страница 58: ...late Release the drive shaft and lift the pressure plate from the body Fig 80 58 8 9 FIGURE 77 FIGURE 79 FIGURE 78 FIGURE 80 Keeping the flange 1 as straight as possible lift it off the shaft and stud...

Страница 59: ...1 FIGURE 83 FIGURE 82 FIGURE 84 Lift drive gear 5 and idler gear 7 straight up out of the motor body Fig 81 To remove the bottom pressure plate 9 13 in SPM25 from the motor body use an adjustable slee...

Страница 60: ...st of the parts are inter changeable the body and gears may not be Fig 88 15 16 17 18 19 20 21 60 FIGURE 85 FIGURE 87 FIGURE 86 FIGURE 88 To disassemble the rear section it will be necessary to revers...

Страница 61: ...dry with compressed air This action should remove any foreign matter trapped in the motor Inspect the parts carefully For detailed instructions see Inspec tion of Parts section 61 22 23 24 25 26 FIGU...

Страница 62: ...Make sure that the mark made in Step 2 is facing you If a new body is used it does not matter which way the body faces Fig 91 REASSEMBLY 27 28 29 Install center separator 16 end separator 15 and seal...

Страница 63: ...PLATE Coat the journals of drive gear 6 with clean hydraulic oil and with the splined end up insert it into the bore nearest you DO NOT DROP IT INTO PLACE Slide it into place gently Dropping it will d...

Страница 64: ...FRONT DRIVE TO BE TIMED WITH REAR DRIVE BY LINING UP A TOOTH ON REAR DRIVE WITH VALLEY OF TWO TEETH ON FRONT DRIVE SKETCH A 64 FIGURE 97...

Страница 65: ...acing you and the o ring facing down the shaft until it makes contact with the dowels Caution should be used from this point on to prevent the bearings from pinching or up setting the back up rings as...

Страница 66: ...body up and install o ring 34 and spline coupling 31 Make sure the gears are not turned from the timing position until after the other set of gears has been assembled Fig 103 Install motor body 2 wit...

Страница 67: ...down until they are snug Place the motor in a machinist vise using a clean block of wood between the flats on each side of the motor and the jaws of the vise Tighten two opposite nuts on each end and...

Страница 68: ...ts show excessive wear replace them with new parts For further information on inspec tion of parts see applicable por tions of PUMP TROUBLESHOOTING GUIDE or DIAGNOSING TYRONE GEAR PUMP FAILURES INSPEC...

Страница 69: ...jaws of a vise or other appropriate support Use a punch and mallet or a light hammer and tap the old seal out of the bore USE EXTREME CARE IN THIS PROCEDURE Do not mar the machined surfaces of the fl...

Страница 70: ...e vise and press the seal into bore until it seats against the shoulder in the bore Fig 111 7 70 Install the snap ring making sure it snaps into the groove properly Fig 112 8 Wash the flange in clean...

Страница 71: ...s the old seal out of the plate USE EXTREME CARE IN REMOVING THE SEAL Press it straight out of the seal bore If a punch and hammer are used move the punch around the seal so that it causes even moveme...

Страница 72: ...and press the seal into the bore The seal will seat with about half of its thickness dimension still protruding from the bore This protrusion serves as a pilot while reinstalling the plate on the flan...

Страница 73: ...Place the assembled seal plate over the shaft and carefully slide it down into position on the flange Install and tighten the seal plate capscrews 73 12 FIGURE 118...

Страница 74: ...FRONT DRIVE MOTOR before s n 237 74 FIGURE 119...

Страница 75: ...75 FIGURE 120...

Страница 76: ...c u r e l y s h a f t u p u s i n g a c l e a n b l o c k o f w o o d b e t w e e n t h e f l a t s o n e i t h e r s i d e a n d t h e j a w s o f t h e v i c e T h i s k e e p s f r o m m a r r i n...

Страница 77: ...mp body Using clean hydraulic oil coat the inside of the pump body liberally This will insure easier assembly Examine the two isolation plates You will find that they are slightly dif f e r e n t C h...

Страница 78: ...back up ring so that it seats itself in to the groove in the edge of the back up ring EXAMPLE Model No 25660A D Denotes Counter clockwise Rotation Model No 25660C D Denotes Clockwise Rotation If the p...

Страница 79: ...g Install the back up ring Install the O ring as in the bottom of the pump Examine the seal If it is damaged or if REASSEMBLY previous leakage has been evidence replace See SEAL REPLACEMENT for detail...

Страница 80: ...ght but should turn freely with a max imum of 5 to 10 lbs torque If shaft will not turn as stated dis assemble the pump and examine for burrs or foreign material causing build up or interference in th...

Страница 81: ...s h t h e s e a l r e t a i n e r i n s o l v e n t a n d blow dry P l a c e t h e c a s t s u r f a c e o f t h e r e t a i n e r against the stationary jaw of a machin ist s vise Place the metal fa...

Страница 82: ...t securely in the O ring groove Coat the shaft liberally with heavy grease to protect the lips of the seal Replace the retainer assembly by care fully sliding over the shaft R e p l a c e t h e c a p...

Страница 83: ...screw driver Take care not to damage the bores After removal wash the parts thoroughly in sol vent Press in the body bearings so that they protrude above the surface 220 230 Press flange bearings in...

Страница 84: ...m o v e d w i p e d c l e a n a n d r e i n s t a l l e d u s i n g L O C T I T E 2 4 2 b l u e m e d i u m s t r e n g t h o r L O C T I T E 2 7 1 red high strength Grade 5 3 radial dashes 120 degree...

Страница 85: ...i t h e r s w a g e d o r b r a z e d t y p e T h e s w i v e l n u t s w i l l n o r m a l l y withstand this torque for a minimum of 15 repeated assemblies T h e t o r q u e r e q u i r e d t o s e...

Страница 86: ...SHOWN IN 4 WHEEL HI LO SWITCH SHOWN IN LO SERIES PARALLEL SWITCH SHOWN IN PARALLEL FLOW SWITCH SHOWN IN LOW FLOW POSITION NEUTRAL START SWITCH SHOWN IN NEUTRAL 86 ELECTRIC SCHEMATIC MODEL 534 WITH CHR...

Страница 87: ...SOLENOIDVALVECIRCUITSHOWNIN4 WHEEL A BSWITCHSHOWNINB SERIES PARALLELSWITCHSHOWNINPARALLEL NEUTRAL START SWITCH SHOWN IN NEUTRAL ELECTRICAL SCHEMATIC MODEL 534 WITH FORD ENGINE 87 FIGURE 150...

Страница 88: ...FIGURE 150 FIGURE 151 88...

Страница 89: ...FIGURE 152 89...

Страница 90: ...FIGURE 151 FIGURE 153 90...

Страница 91: ...FIGURE 154 91...

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