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tbeck

Posted 6/7/2007 18:02 (#159785)
Subject: Adjusting SCV's, JD 4250

Culbertson, MT

Having troubles with a 4250, hydraulics drift. Disk comes up or down, loader won't stay level, etc. Is there an adjustment in the scv's? Some leakage but is likely the outer o-rings. Also, will poor tips cause this situation? Thanks!

Jon

Posted 6/7/2007 18:23 (#159789 - in reply to #159785)
Subject: RE: Adjusting SCV's, JD 4250

Callao Missouri

Pull both scv's and have new valves put in and grind the seats. There is an update on the valves, the new ones have a Teflon insert inside the sealing area. Jon.

Virginia Veg.

Posted 6/7/2007 18:54 (#159799 - in reply to #159785)
Subject: What Jon said.

Eastern VA. No such thing as too many Magnums.

I could buy us both a fancy supper if I had $1 for every SCV I've rebuilt. The valves need to be replaced like Jon said. Personally, I liked the old steel valves better than the teflon, but you can't get the steel ones anymore. You used to be able to buy the seat grinding tool, but its been a long time now since they discontinued the 20-60 series style SCV. You should also reset the detents while they're on the bench. You need a dial indicator and some allen wrenches to adjust it right. Any Deere dealer should be able to do it. You can just take the SCVs to the dealer. Put new o rings in between the SCV housing and the rockshaft housing when you take them off too. Don't forget that valve # 3 has a different cam lever, so don't mix # 3 up with the other two or you'll wonder why you have to adjust the linkage. Your valves are leaking because of item #21 in the picture below.

KEY PART NO. PART NAME QTY TRANSMISSION SERIAL NO. 4050 4250 4450 REMARKS
1 R46722 SNAP RING 1 X X X
2 R70979 GUIDE 1 -XXXXXX X X X (C) (SUB RE15926 AND R79778)
R79778 GUIDE 1 XXXXXX- X X X (D)
3 R26546 BACK-UP RING 1 X X X
4 B2762R O-RING 1 X X X
5 R64607 SPRING 1 X X X
6 R43816 SNAP RING 1 X X X
7 24M7055 WASHER 1 X X X 0.331" X 0.630" X 0.063"
8 R75743 SPRING 1 -XXXXXX X X X (C) (SUB RE15926 AND R79778)
R79774 SPRING 1 XXXXXX- X X X (D) (ORDER RE15926)
KEY PART NO. PART NAME QTY TRANSMISSION SERIAL NO. 4050 4250 4450 REMARKS
9 R70968 PISTON 1 -XXXXXX X X X (C) (SUB RE15926 AND R79778)
R79776 PISTON 1 XXXXXX- X X X (D) (ORDER RE15926)
10 R70978 SPRING 1 -XXXXXX X X X (C) (SUB RE15926 AND R79778)
R79773 SPRING 1 XXXXXX- X X X (D)
11 R70987 SPRING PIN 1 -XXXXXX X X X (C) (SUB RE15926 AND R79778)
R79775 SPRING PIN 1 XXXXXX- X X X (D) (SUB RE15926)
12 R70986 DETENT 1 -XXXXXX X X X (C) (SUB RE15926 AND R79778)
R79777 DETENT 1 XXXXXX- X X X (D) (ORDER RE15926)
13 RE15926 KIT 1 X X X
14 R51411 PIN 1 X X X
KEY PART NO. PART NAME QTY TRANSMISSION SERIAL NO. 4050 4250 4450 REMARKS
15 R70985 CAM FOLLOWER 1 X X X
16 R51409 SPACER 1 X X X
17 R26484 BACK-UP RING 6 X X X (4 (A), 2 (B))
18 A3917R O-RING 6 X X X (4 (A), 2 (B)) (SUB FOR R65286)
19 R51409 SPACER 4 X X X
20 34H242 SPRING PIN 4 X X X 1/8" X 7/16"
21 AR86535 VALVE 4 X X X
22 R65501 SPRING 2 X X X (A)
R65502 SPRING 2 X X X (B)
23 R66416 BUSHING 4 X X X
KEY PART NO. PART NAME QTY TRANSMISSION SERIAL NO. 4050 4250 4450 REMARKS
24 R27166 O-RING 4 X X X
25 R41057 BACK-UP RING 4 X X X
26 R74695 WASHER 1 X X X
27 R59629 CAP 1 X X X (SUB FOR R71245)
28 19H988 CAP SCREW 4 X X X 3/8" X 1-1/4"
29 R62652 ARM 1 X X X
30 34H231 SPRING PIN 1 X X X 3/32" X 3/4"
31 R41057 BACK-UP RING 1 X X X
32 R27166 O-RING 1 X X X
33 R71054 CONTROL VALVE 1 X X X
KEY PART NO. PART NAME QTY TRANSMISSION SERIAL NO. 4050 4250 4450 REMARKS
34 A3917R O-RING 1 X X X (SUB FOR R65286)
35 R26484 BACK-UP RING 1 X X X
36 R71055 VALVE 1 X X X
37 R71056 SPRING 1 X X X
38 R70034 VALVE 1 X X X
39 P46051 O-RING 1 X X X
40 R40937 BACK-UP RING 1 X X X
41 R41339 SHIM 1 X X X
42 VALVE 1 X X X (ORDER AR94264)
43 VALVE 1 X X X (ORDER AR94264)
KEY PART NO. PART NAME QTY TRANSMISSION SERIAL NO. 4050 4250 4450 REMARKS
44 AR94264 CHECK VALVE 1 X X X (NLA)

(A) RETURN (B) PRESSURE
RETOUR PRESSION
RUECKLAUF DRUCK

(C) ( -XXXXXX) 4050-001904; 4250-002469; 4450-005399

(D) (XXXXXX- ) 4050-001905; 4250-002470; 4450-005400

Edited by Virginia Veg. 6/7/2007 18:57

(50seriesSCV.jpg)

Attachments
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50seriesSCV.jpg (97KB - 417 downloads)

msb

Posted 6/7/2007 20:38 (#159828 - in reply to #159785)
Subject: Re: Adjusting SCV's, JD 4250

Lapel, In

Done my share too, but I prefer to use the old 1/4 turn on the pressure valves and 1/8 turn on the return valves. Its a lot easier and quicker with fewer lickovers in my opinion than it is using a dial indicator. You can make your own adjustment jig using the cover cap #27 in the parts shown.Hardest part is drilling and tapping a hole on angle for the hydraulic detent. Same home made jig will aalso work on both the older 10 series and 20 series SCvs.

Jon

Posted 6/7/2007 23:05 (#159903 - in reply to #159828)
Subject: Re: Adjusting SCV's, JD 4250

Callao Missouri

I have done the 1/8 and 1/4 turn to, it is faster, kinda depends on what I feal like that day. Jon

ronm

Posted 6/8/2007 09:22 (#160023 - in reply to #159785)
Subject: Re: Adjusting SCV's, JD 4250

Fruita CO

I'd show you guys my setup for adjusting SCV's, but I'm scared one of you would steal it & get rich...way more accurate than just a 1/4 turn, way less fussy than a dial indicator...works for me...;o)

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