wd45 hydraulic pump adjustment brands

There was nothing better to to on a rainy day in southern Illinois so my brother and I began working on the pump. We adjusted all the linkage according to the manual and with plenty of fluid it would only put out about 1500 psi at the remote outlet instead of the 3500. We pulled the pump off. It took quite allot of wiggling and cussing to get it out from between the frame rail and the housing!!! Got it out and laid on the work bench. All four cam followers still seemed to be spring loaded. The adjusting screw seemed to still move the control valve but not certain. We got this far, can our orange friends guide us further into this project?? Thanks, Ryan

To adj the pressure, remove the 4 -1/4 in bolts on front of pump holding plate on. There will be two valves exposed. Tap quick and lightly on the one closest to pumping plungers. It should bounce out farenough to get ahold of. Pull it out easy to keep every thing togather. There will be shims between spring and plunger. Add shims to increase pressure.

On spool opposite the pressure spool, drive the spool assy. to back of pump and replace the two orings along with two orings on pressure spool (unloading valve).

Just take your time and pay attention to detail.It"s not as intimidating as you think and you really can"t mess up much.I"d say keeping track of the direction and order of the control vavles and sleeves would be the most critical if you remove them.Mack"s advise had you leaving them in and alone.If it"s pumping good they are are not your problem as far as pressure goes.Sometimes they can get tiny bits of FM in them that don"t let them shift position which controls pump flow rate.Let"s say you tear it all apart and don"t have a clue how to put back.Put all the pieces in a box and take it to someone who knows these old units and they can whip it back together in short order.It ain"t really that high tech.

Do you have a transport valve on that tractor? My pump quit suddenly one spring and wouldn"t lift the disc. I found the shoulder on the relief spool had cracked and broke completely off letting the pump bypass continually. If you get a little piece of gunk on the ball or seat behind the relief spool it could be leaking by.

Ryan, Don"t be intimidated by working on the hyd pump. Just keep all the parts in order as they are removed. Keep the parts in clean diesel oil so they will not enlarge. Be sure to clean the pump. As said above it does not take much to foul up action.

Looks like you have gotten the pump working as suggested. However you do not have pressure Could be a leak somewhere. O-rings ect. Check spring pressure to be certain there are no broken springs. Are all the plungers moving well. Pull them out and see if there are any broken springs under them. Look closely.

Charlie, we were told from the factor to batter the end of nails to make tools to hold the cam followers in. If the pump does not come out easily then go to lunch. I did that came back and it almost fell out.

I"m thinking maybe all 45"s had transports but not sure. On the "nail" tip,you"ll see where to wedge them in the lever when you compress it down by hand.Once you"ve cleared the housing with the rollers and the pump is kinda hanging on the pickup tube,you can pull them out with pliers easily.Don"t drop one inside housing!

The thumbscrew on front adjusts amount of oil pumped.It should be out against the clutch hsg when pump is mounted.Some suggest screwing all in then out to fix a stuck valve if pump seems slow. Screw it in 1/2 for mounting pump then back it out(more clearence).Your pressure problem isn"t affected by this side of pump.Edited by Steve M C/IL - 24 Apr 2011 at 11:06pm

It still aint right!! We took pump off and very carefully started our rebuild. Ordered a seal and plunger kit from Agco part#70255272. All control valves were not stuck and were oiled and correctly reinstalled. All springs were not broken but replaced anyway. The only issue was the unloading valve assembly which Agco told me was no longer available but had a outside supplier. After all linkage was adjusted the pump was just as weak as before we started. It only would put out 1500psi and would slowly drop!! What are we missing?? The unloading valve from the after market supplier or what?? I don"t know whats left to work on. Ryan

Did the pump work OK say last year? You could add about .020 inch of shim to add about 1400psi but if it worked before and has recently lost pressure or volume, there is something wrong with the pump.

My new one from agco, several years ago wasn"t machined complete and caused my pump to unload at over 9000psi. I took it back apart and found a 1/4 inch diameter c"bore missing down inside the back end. That was like adding a 1/4 inch shim to the front.Edited by CTuckerNWIL - 28 May 2011 at 9:51pm

Years ago I put a new unloader in my 45 and it didn"t help a bit.Had 11 shims and still eradic unload pressures.Doubt unloader is culprit but this seems to be the $64000 question no one can answer.I"ve got a 5/16 washer with the center trimmed out as an additional shim and it"s useable.Always good pressure at/off idle but not at half throttle or more.Always suspected the check ball on back end of pump where it transfers to control valve of not holding and getting a "bounce back" of pressure which effects unloader but never went to the trouble to prove it.They didn"t include that "valve" in my rebuild kit from AC years ago.It takes pressure on the outlet end of unloader to lift ball off seat.I don"t understand how mine can vary so much but it"s most effected by rpm.I quit beating my head on the wall on got it useable and quit.

I think thats our next step. We have became real good at removing the pump!! What about the shim issue?? We are reading about 1500psi right now, now many shims would a person add?? Ryan

Can anyone tell me how to somehow convert the single hydraulic to a functioning 2 hose hookup...is there a bypass/throw valve that will allow this to work or....how much of a trouble is it to get this to work..t.i.a.

…Allis Chalmers - Fits: [ the following with cylinder head casting # U3001 (see SN break for WC) and AM3820: WC, WF (both engine SN: 84247 and up) ], WD, WD45 (gas, LP), [ will fit the following if the valve seats are changed (available by special order): WC, WF (older) ]; Replaces: Intake valve:…

…up), [ W201, W25 (Power Unit) ], W226 (early) Allis Chalmers - Fits: [ the following with cylinder head casting # U3001 (see SN break for WC) and AM3820: WC, WF (both engine SN: 84247 and up) ], WD, WD45 (gas, LP), [ will fit the following if the valve seats are changed (available by special order):…

…regulating spring, 1 used per engine: B116 (all Power Units) Allis Chalmers - Fits: [ used as a hydraulic pump pressure regulating ball valve spring: D10, D12, D15, D17, D19 (4 used) ], D14 (3 used), [ WD, WD45 (5 used) ], WD45 (diesel, 5 used), [ used as an engine oil pump pressure regulating…

Allis Chalmers - Fits: [ WC, WD (With Live Hydraulics) ], WD45 (Gas & Diesel With Live Hydraulics) Case - Fits various models Cockshutt - Fits: Co-Op with Buda Over Head Valve Engine: E3, E4, E5, Cockshutt: 30, 35, 40, 50, 560, 570 International / Farmall - Fits: H, HV, M, MD, MDV, MTA, MV, Super H,…

…(Power Unit) ] Allis Chalmers - Fits: the following with G226 4-cylinder gas, LP engines with cylinder head casting # AM4469 or AM4472: 170, 175, D17, [ the following with cylinder head casting # U3001 (see SN break for WC) and AM3820: WC, WF (engine SN: 84247 and up) ], WD, WD45 (gas, LP), [ will…

…(Power Unit) ] Allis Chalmers - Fits: the following with G226 4-cylinder gas, LP engines with cylinder head casting # AM4469 or AM4472: 170, 175, D17, [ the following with cylinder head casting # U3001 (see SN break for WC) and AM3820: WC, WF (engine SN: 84247 and up) ], WD, WD45 (gas, LP), [ will…

…(Power Unit) ] Allis Chalmers - Fits: the following with G226 4-cylinder gas, LP engines with cylinder head casting # AM4469 or AM4472: 170, 175, D17, [ the following with cylinder head casting # U3001 (see SN break for WC) and AM3820: WC, WF (both engine SN: 84247 and up) ], WD, WD45 (gas, LP), […

…with 201 or 226 cubic inch engines) ], Power Unit: W201, W226, Speed Patrol: W (Gas/LP with 201 or 226 cubic inch engines) Allis Chalmers - Fits: [ D17, WC, WD, WD45, WF, 170, 175 (Gas/LP with 201 or 226 cubic inch engines) ]; Replaces: 255297, 70255297 * Cork Rubber* 1/4" Thick* 20-3/4" Long*…

…D (Diesel) AC Miscellaneous - Fits: Cotton Picker: 801, 802, [ Forklift: FL100, FL120, FL60, FL70, FL80 (Gas, LP and diesel) ] Allis Chalmers - Fits: [ D17, WD45 (Diesel) ], D19 (Gas and diesel), [ Forklift: F120, FD100, FD120, FD60, FD70, FD80, FP60, FP70, FP80 (Gas, LP and diesel) ]; Replaces:…

Allis Chalmers - Fits: [ B, C, CA, G, RC, WC, WD, WD45, WF (With cut out relay on generator) ], Industrial: IB (With cut out relay on generator); Replaces: 208197, 70208197 Avery - Fits: [ A, BF, BG, R (Serviceable, with cut out on generator) ]; Replaces: AT261 Case - Fits: [ VA, VAC, VAC-11,…

…EIII AC Industrial - Fits: all gas, LP: 201 (Power Unit, early 226 c.i. power unit), TL10 (Loader) Allis Chalmers - Fits: all gas, LP: D (Grader, up to SN: 3370), D17 (up to SN: 24001), WC, WD, WD45, WF; Replaces: 229181, 70229181 * 3.040" overall length* 0.550" O.D.* 0.073" wire…

…(diesel) ] AC Miscellaneous - Fits: [ Cotton Picker: 622, 801, 802 (all gas, LP, diesel) ], Industrial: TL14A (all gas, LP, diesel) Allis Chalmers - Fits: [ D15, D17, WD45 (all diesel) ], [ D19, D21, 180, 185, 190, 190XT, 200, 210, 220, 4W220, 6060, 6070, 6080, 7000, 7010, 7020, 7030, 7040, 7045,…

AC Industrial - Fits: Some: I60, I600 AGCO - Replaces: 10P3938 Allis Chalmers - Fits: Some: 170, 175, D15 (SN: 9001 and up ), D17, D19, H3 (SN: 6960 and up), WD45; Replaces: 226458, 233-543, 70226458 Case - Fits: Some: 400, 410, 411, 412, 413, 415, 425, 540, 630, 634, 640, 641, 642, 644, 700, 710,…

Allis Chalmers - Fits: WC, WD, WD45, WD45 (Diesel) Case - Fits various models Cockshutt - Fits: Co-Op with Buda Over Head Valve Engine: E3, E4, E5, Cockshutt: 30, 35, 40, 50, 560, 570 International / Farmall - Fits: H, HV, M, MD, MDV, MTA, MV, Super H, Super HV, Super M, Super MD, Super MDV, Super…

Allis Chalmers - Fits: D17, WD45 Carb Mfg #"s - TSX464, TSX561, TSX773, TSX797, TSX871 Kit includes:* throttle shaft* needle and seat* float lever pin* choke and throttle shaft seal* needle valve* adjustment screw* gaskets and instructions Includes parts shown in picture above.* For reassembly…

Allis Chalmers - Fits: B, C, CA, D10, D12, D14, D15 (up to sn 9001), RC, WC, WD, WD45, WF Case - Fits: DC, LA, SC, [ VA, VAC, VAH (up to sn 5400000) ], 900 Case Industrial - Fits: 600 Skidder Cockshutt - Fits: Co-Op with Buda Over Head Valve Engine: E3, E4, E5, Co-Op with Continental F124: E2,…

…[ Motor Grader: DG, M65 (Gas, LP) ], [ Power Unit: W201, W226 (Gas, LP) ], Speed Patrol: W (Engine SN: 72459 with 15 stud head) Allis Chalmers - Fits: [ D17, WD, WD45, 170, 175 (Gas, LP) ], [ Will fit 12 stud head, but will end up with (3) 3/8" holes that will not be used.: WC, WF (Gas, LP) ];…