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, Im having trouble with a John Deere 8440. Does supply pump…

Hi, Im having trouble with...
Hi, Im having trouble with a John Deere 8440. Does supply pump in the rear supply oil for a pump that operates the clutch as well as the front pressure pump?
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Answered in 23 hours by:
2/25/2015
Mechanic: Dan, Technician replied 7 years ago
Dan
Dan, Technician
Category: Agriculture and Farm Equipment
Satisfied Customers: 15,140
Experience: 17+ yrs. shop and field experience with all major brands of heavy equipment, trucks and farm equipment - 1995 WyoTech graduate.
Verified
Dan :

Hi it's Dan. I will be glad to help. Sorry I wasnt available when you posted your question initially. You have a main hydraulic pump driven off the front crankshaft pulley. A common failure is the pump drive coupling causing the main pump not to turn. Check for that first between the pump and front crankshaft pulley.

Dan :

This is the main pump for your hydraulics and steering, etc.

Dan :

The clutch pump is a separate pump. Here are some diagrams to help.

Dan :

CLUTCH OIL PUMP INTAKE TUBES


























































































































































































































CartkeyPART NO.PART NAMEQTYSERIAL NO.84408640REMARKS
119H1726Cap Screw1XX3/8" X 2-1/4"
212H304Lock Washer3XX3/8"
324M7096Washer2XX10.500 X 18 X 1.600 mm
4R58925Clamp6XX
528H1525Bushing1XX0.493" X 0.675" X 1-1/16"
619H2549Cap Screw1XX3/8" X 1-7/8"
728H1697Spacer2XX0.493" X 0.675" X 3/4"
8R61287Oil Tube1XX
9AR21839Clamp2XX(SUB TY22467)
10R58926Hose1XX32 X 533MM (1-1/4" X 21")
CartkeyPART NO.PART NAMEQTYSERIAL NO.84408640REMARKS
11R29463O-Ring2XX
12R58924Oil Tube1XX
1319H2549Cap Screw1XX3/8" X 1-7/8"
14R58928Bracket1XX
1514H1076Nut1XX3/8"
16R61334Bracket1XX
17AR26375Screen1XX(STEEL)
R53169Screen1XX(NYLON)
18A4808RWasher1XX
19R58616Fitting1XX
CartkeyPART NO.PART NAMEQTYSERIAL NO.84408640REMARKS
2019H1731Cap Screw2XX3/8" X 1"
Dan :

CLUTCH OIL PUMP AND OIL TRANSFER PUMP






























































































































































































































CartkeyPART NO.PART NAMEQTYSERIAL NO.84408640REMARKS
1R40336Dowel Pin3XX
2R51029Dowel Pin1XX
3AR68503Housing1XX
4U44083O-Ring1XX
5AR72225Gear1NLA; ORDER AR55234 AND R57986
R57986Gear1XX
6R57207Shaft1XX
726H73Shaft Key2XX5/32" X 5/8"
8R57205Cover1XX
9AR40218Gear1XX
CartkeyPART NO.PART NAMEQTYSERIAL NO.84408640REMARKS
10R26144Shaft1XX
11AR68504Housing1XX
12R394RO-Ring1XX
13A3606RO-Ring1XX
14R43252Cap Screw4XX
15R57203Shaft1XX
1626H73Shaft Key1XX5/32" X 5/8"
17R55408Wear Ring1XX
18JD8509Ball Bearing1XX
19R57942Gear1XX
CartkeyPART NO.PART NAMEQTYSERIAL NO.84408640REMARKS
20M40514Snap Ring1XX
21AR55234Gear1XX
22R57986Gear1XX
Dan :

HYDRAULIC PUMP DRIVE AND SUPPORT




















































































































CartkeyPART NO.PART NAMEQTYSERIAL NO.84408640REMARKS
1M63440Lock Nut2X(SUB E50102)
2R34362Clamp2X
3R49724Screw2X
4AR49427Bushing1X(PKG OF 4) (SUB (4) R45822)
5R34360Screw2X
619H1732Cap Screw2X3/8" X 1-1/4"
7R59620Shaft1X
8R58101Support1X
......Cushion1X25 X 25 X 187MM (1" X 1" X 7-3/8 "), (MAKE FROM R30937 HYDRAULIC PUMP SUPPORT TO HYDRAULIC PUMP)
919H3586Cap Screw2X1/2" X 4-1/4"
CartkeyPART NO.PART NAMEQTYSERIAL NO.84408640REMARKS
19H1991Cap Screw2X1/2" X 8"
1019H2116Cap Screw2X3/8" X 2-1/2"
Dan :

HYDRAULIC PUMP DRIVE AND SUPPORT













































































































CartkeyPART NO.PART NAMEQTYSERIAL NO.84408640REMARKS
1M63440Lock Nut2X(SUB E50102)
2R34362Clamp2X
3R49724Screw2X
4AR49427Bushing1X(PKG OF 4) (SUB (4) R45822)
5R34360Screw2X
619H1732Cap Screw2X3/8" X 1-1/4"
7R49723Shaft1X
8R66837Support1X
919H2211Cap Screw2X1/2" X 5" UPPER
19H3339Cap Screw2X1/2" X 9-1/2" LOWER
CartkeyPART NO.PART NAMEQTYSERIAL NO.84408640REMARKS
1019H2116Cap Screw2X3/8" X 2-1/2"
Dan :

REPLACEMENT HYDRAULIC PUMP ASSEMBLY


































CartkeyPART NO.PART NAMEQTYSERIAL NO.84408640REMARKS
1AR94661Hydraulic Pump1XX65 CM3 (4 IN.3), (MODEL JA1) (SU B FOR AR70722, AR73106 OR AR99839)
219H1990Cap Screw4XX1/2" X 2-1/4"
Dan :

If the coupling is ok then check your filter for metal/debris that would indicate a pump failure or component failure. Let me know if you need more help

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Mechanic: Dan, Technician replied 7 years ago
Our chat has ended, but you can still continue to ask me questions here until you are satisfied with your answer. Come back to this page to view our conversation and any other new information.

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If you haven’t already done so, please rate your answer above. Or, you can reply to me using the box below.Hi Simon, We can follow up here if you still need help.
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Customer reply replied 7 years ago
Hi dan. The front pump is turning, no problem in the drive component. Do you have info on where to plumb a hydraulic pressure gauge into the tractor at different locations so I can see what pressure each pump is putting out.
Mechanic: Dan, Technician replied 7 years ago
Hi Simon. I do not have the service book for this model unfortunately but there are some available on the web either new, possibly pdf and CD versions or used ones on ebay or other sites. Without the manual you use the parts manual for some general locations as in most cases the pressures are taken at the control valves and hydraulic manifolds. There will be plugged ports you can tie your gauges into. Also, in cases where teeing into the actual hose for a particular function always works too. you will need to deadhead the function and bring to full RPM to get therelief pressure on that circuit. Here is one link for a vendor that sells the manual TM1199. http://www.jensales.com/John-Deere-8440-Tractor-Service-Manual-TM1199_p_82035.html

You can google John Deere TM1199 for other options and availability.
Dan
Dan, Technician
Category: Agriculture and Farm Equipment
Satisfied Customers: 15,140
Experience: 17+ yrs. shop and field experience with all major brands of heavy equipment, trucks and farm equipment - 1995 WyoTech graduate.
Verified
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Dan
Dan
Dan, Technician
Category: Agriculture and Farm Equipment
Satisfied Customers: 15,140
15,140 Satisfied Customers
Experience: 17+ yrs. shop and field experience with all major brands of heavy equipment, trucks and farm equipment - 1995 WyoTech graduate.

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