4640 Hydraulics slow

We have a 4640 that the brake pads fell apart so there was a lot of debris in the rear end. We have cleaned/replace both filter multiple times and there doesn't seem to be any junk left in them. The tractor works fine until it gets warmed up and then it steers hard and hydraulics are super slow. Does anybody have any ideas of what may be causing it? Oh yeah we changed the brakes, so that is no longer an issue. Thanks!

And did you clean the sump screen??? The transmission pump gets all the fine abrasive stuff ran through it "before the oil gets to the filters,,This eats up the pump, and will show up when the oil warms up...

Have you checked stand-by pressure?

I have not checked stand-by pressure yet. I was wondering about the trans pump. How do you access the pump? I can't find it.

You can check trans pump pressure & flow but to access trans pump one needs to remove rockshaft housing if tractor is a Quad-range trans.

Hello

Is this tractor fixed yet?...

Hello

Is this tractor fixed yet?...

(quoted from post at 12:31:03 02/21/14) I have not checked stand-by pressure yet. I was wondering about the trans pump. How do you access the pump? I can't find it.

Click to expand...

parts catalog curtsey of Mother Deere.

http://jdpc.deere.com/jdpc/servlet/com.deere.u90490.partscatalog.view.servlets.HomePageServlet_Alt

TRANSMISSION OIL PUMP
(QUAD-RANGE)
Cart KEY PART NO. PART NAME QTY TRACTOR SERIAL NO. 4640 4840 REMARKS
1 AR79836 OIL LINE 1 X
2 R82161 MANIFOLD 1 X (SUB FOR R63998)
3 AR78652 GEAR 1 X (SUB AR78649) (ALSO ORDER RE20919)
4 AR78653 GEAR 1 X (SUB AR78649) (ALSO ORDER RE20919)
5 R51029 DOWEL PIN 1 X
6 RE20919 HOUSING 1 X (SUB FOR AR85539) (MARKED R63997 OR R82164) (ALSO ORDER AR78649)
7 A3606R O-RING 1 X
8 R64406 OIL LINE 1 X
9 A3917R O-RING 1 X
10 AR71016 OIL LINE 1 X
Cart KEY PART NO. PART NAME QTY TRACTOR SERIAL NO. 4640 4840 REMARKS
11 R40147 FITTING 1 X
12 A4808R WASHER 1 X
13 R53169 SCREEN 1 X (NYLON)
AR26375 SCREEN 1 X (STEEL)
14 R41008 CAP SCREW 2 X
15 R67247 BOLT 2 X (SUB FOR R64401)
16 R27218 FITTING PLUG 1 X
17 R26448 O-RING 1 X
18 R26372 SPRING 1 X
19 R42849 BALL 1 X 9MM (3/8")
Cart KEY PART NO. PART NAME QTY TRACTOR SERIAL NO. 4640 4840 REMARKS
20 R56462 O-RING 2 X (SUB FOR B2762R, THIS APPLICATION)
21 R66049 PIN FASTENER 1 X
22 F3171R O-RING 1 X
23 AR72101 FITTING PLUG 1 X
24 R41168 CAP SCREW 1 X
25 R51383 SELF-LOCKING SCREW 1 X
26 15H558 PIPE PLUG 1 X 1/8"
27 R41008 CAP SCREW 1 X (SUB FOR R43252)
28 R64407 OIL TUBE 1 X
29 R41041 CAP SCREW 1 X
Cart KEY PART NO. PART NAME QTY TRACTOR SERIAL NO. 4640 4840 REMARKS
30 24H1653 WASHER 1 X 13/32" X 1-1/4" X 0.120"
31 R48792 WASHER 1 X
32 R66061 HALF CLAMP 1 X
33 19H2284 CAP SCREW 1 X 3/8" X 7/8"
34 R30959 LOCK PLATE 1 X
35 T13814 CLAMP 1 X

b&d
Are you implying that PHOY needs to replace all the part numbers you listed to correct his tractors hyd problems? If so I disagree.

I'm telling him that the pump exists and what it looks like.

(quoted from post at 08:38:02 11/26/14)
I'm telling him that the pump exists and what it looks like.

Click to expand...

Naw what you posted appears like part numbers BUT the photo below is what the pump looks like. :wink:

Alright . What is the secret to post those parts book images ?

(quoted from post at 10:54:03 11/26/14)
Alright . What is the secret to post those parts book images ?

Click to expand...

No Secret but it's easier to post photo's if one lives in Texas and custom bales hay!!! :lol:

Right click on selected photo. left click on "save image as" which will download photo to one's computer. I post on Modern view so I click on "choose files" then click on selected photo in "downloads" & WALLA photo is downloaded in my post.