Search found 231 matches

by rid54
Tue Sep 15, 2020 8:55 pm
Forum: DBTC Forum
Topic: 1212 dynamo charging
Replies: 25
Views: 677

Re: 1212 dynamo charging

The test you just did, is described in the document describing the dynamo test. At idle speed, the voltage should be 10-13 V and then rise rapidly with engine RPM. Going above 20 V is not recommended. If the voltage does not reach the stated value and does not rise rapidly, the dynamo is faulty. If ...
by rid54
Sun Sep 13, 2020 9:52 pm
Forum: DBTC Forum
Topic: 1212 dynamo charging
Replies: 25
Views: 677

Re: 1212 dynamo charging

The dynamo output is depending on armature RPM ("speed") and the strength of the stationary field. The latter depends on the current flowing into the "F", or Field connector on the dynamo. You may need to verify that there is a field current flowing into the stator magnets from the control box. The ...
by rid54
Thu Sep 03, 2020 10:49 am
Forum: DBTC Forum
Topic: 1212 dynamo charging
Replies: 25
Views: 677

Re: 1212 dynamo charging

The link that was posted earlier in this thread includes a "folder" about DB electrical equipment. The text therein describes a sort of polarizing procedure for the dynamo, to ensure proper direction of the residual magnetic field in the yoke. Did you try this?
by rid54
Wed Sep 02, 2020 2:56 pm
Forum: DBTC Forum
Topic: Dash lights.
Replies: 15
Views: 575

Re: Dash lights.

Ah, yes; the infamous ground faults. They can drive anyone nuts... In this case, however, there SHOULD be only one feed and three different ground paths. If this were my tractor I would definitely start with the oil pressure, that is, I would ascertain that the engine works correctly in that respect...
by rid54
Tue Sep 01, 2020 9:03 am
Forum: DBTC Forum
Topic: 1212 dynamo charging
Replies: 25
Views: 677

Re: 1212 dynamo charging

An afterthought: If you speed up the engine until the charge light goes out (1400 RPM?), does it again light up as revs drop beneath this speed, or does it continue to be out at normal idle?
by rid54
Mon Aug 31, 2020 9:31 pm
Forum: DBTC Forum
Topic: 995 thrust bearing
Replies: 9
Views: 284

Re: 995 thrust bearing

Thanks all. The clutch shaft was seized solid when I bought it and someone had bolted on a lever to pull the clutch up manually. I only replaced the clutch plates as the rest of the clutch looked ok. I bought the plates from agriline. When the adjusting nut is loose there is a 2 inch gap between Th...
by rid54
Mon Aug 31, 2020 9:02 pm
Forum: DBTC Forum
Topic: 1212 dynamo charging
Replies: 25
Views: 677

Re: 1212 dynamo charging

Probably you need to do a deeper diagnostic effort here. The charge light current is used for basic magnetization of the field. As the dynamo spins up, the armature voltage should approach and surpass the battery voltage to commence charging and at that point the charge light goes out and the regula...
by rid54
Mon Aug 31, 2020 7:32 pm
Forum: DBTC Forum
Topic: 1212 dynamo charging
Replies: 25
Views: 677

Re: 1212 dynamo charging

Older alternators (some) used an external regulator. Later, the regulator was miniaturized and is nowadays usually incorporated in the brush holder.
by rid54
Mon Aug 31, 2020 4:43 pm
Forum: DBTC Forum
Topic: 1212 dynamo charging
Replies: 25
Views: 677

Re: 1212 dynamo charging

Assuming this is a 12 V system... is it with 100% certainty a 12 V dynamo, the new one? Stupid Q perhaps, but I've heard of dynamos that do come in different voltage makeup while being mechanically identical.
by rid54
Sun Aug 30, 2020 5:08 pm
Forum: DBTC Forum
Topic: 1212 dynamo charging
Replies: 25
Views: 677

Re: 1212 dynamo charging

If you still have the old dynamo, compare pulley diameters. If they differ, you could swap them, I'd guess. On the other hand, the problem may be something else. It is, after all, a system. The pulley diameter should be chosen so as not ever to have the dynamo running at overspeed - that'll damage t...
by rid54
Sat Aug 29, 2020 7:55 pm
Forum: DBTC Forum
Topic: Dash lights.
Replies: 15
Views: 575

Re: Dash lights.

All the lamps are on 12 V + feed from the "ignition" switch and they go to earth through various paths. The oil pressure warning light is connected as described, the filter warning light is earthed through the vaccuum switch in the hydraulic system and the charge warning goes to earth through the re...
by rid54
Sun Aug 09, 2020 8:57 am
Forum: DBTC Forum
Topic: Hydraulic relief valve
Replies: 8
Views: 464

Re: Hydraulic relief valve

Intersting... If the pump can force the relief valve to open, it should be in OK condition, one would assume? Do you know that the max psi is indeed 2000 (measured)? If there is a possibility to measure the psi in the active hydraulic circuit, that may help determine if the relief valve is correctly...
by rid54
Mon Aug 03, 2020 9:01 pm
Forum: DBTC Forum
Topic: 880 Selectamatic safety starter switch
Replies: 25
Views: 938

Re: 880 Selectamatic safety starter switch

Check the area around the clutch pivot shaft. There should be an extension in the casting in the clutch housing where a switch or switch mounting bracket could be mounted with 2 screws. In the clutch pedal arm, near the pivot point, there should be a kind of "cam lobe" that can act on a switch push-...
by rid54
Mon Aug 03, 2020 7:39 am
Forum: DBTC Forum
Topic: 880 Selectamatic safety starter switch
Replies: 25
Views: 938

Re: 880 Selectamatic safety starter switch

My 880 has a safety switch, it is a single unit mounted on the side of the clutch housing and operated by a protrusion on the pivot end of the clutch pedal arm. It is a simple "push to close" kind of switch, no visible mechanics. I'd guess it can be replaced by any kind of similar switch that can be...
by rid54
Sat Aug 01, 2020 9:03 pm
Forum: DBTC Forum
Topic: 990 engine knock
Replies: 12
Views: 474

Re: 990 engine knock

It is probably a question of how much work should be spent on finding a potential problem. I you are already in a process where you want to drop the sump, by all means check everything you can get your hands on, but bearing clearances should be checked with some kind of precision, like using plastig...