Finally decided to take out most of the Valve Chest valves on my David Brown 990. Showing the process of removing and reinstalling all but two of the valves. Not removing the Spool or TCU valves though. I do a mostly failed attempt at using my (badly) crafted version of service tool DB961796 to show the abutment plate setup. Check below for a good list of videos that also cover the Valve Chest!
Like and subscribe if this video is useful!
00:00 - Start
02:11 - The different valves in a Valve Chest
04:11 - Removal of Lowering Control Needle Valve
05:48 - Removal of Bypass Valve
09:50 - Variations of Bypass Valve
10:20 - Removal of Hold Valve
12:43 - Removal of Hold Relief Valve
17:06 - Removal of Rate of Lowering Valve
19:25 - Removal of Latching Valve
20:37 - Removal of Non Return Valve
21:51 - Found an unlisted collar in bore of Non Return Valve
23:18 - Discussion of Spool Valve (Not going to mess with it on my tractor)
23:50 - TCU Valve - not going to disassemble it
24:05 - Adjustments need a special tool
25:10 - Valves laid out on Table
26:52 - Bypass Valve maintenance
27:35 - Keep all the valve parts organized!
27:58 - Discussing Spool Valve travel measurement
29:53 - Checking the travel of the Spool Valve (it's right on target!)
30:39 - TCU Valve discussion
32:24 - Spool Valve Rotation
33:45 - Turning Spool Valve to perhaps help with issues
34:31 - Writing the controls on the housing
34:57 - It's all clean now!
35:38 - Reinstalling the Non Return Valve
38:07 - Reinstalling Rate of Lowering Valve
39:53 - Reinstalling Latching Valve
41:19 - Reinstalling Hold Relief Valve
45:02 - Reinstalling Hold Valve
47:13 - Reinstalling Bypass Valve
51:28 - Tips for removing Bypass Valve while on the tractor
53:24 - Reinstalling the Rate of Lowering Needle Valve
53:58 - Valve Chest is all back together!
54:13 - Mostly failed attempt at making the special tool
56:25 - Nope, not gonna touch the TCU Valve
57:44 - Ok, I think I'm done
*Here's list of videos I've found very useful for the Valve Chest:*
✔ Removing stuck Bypass and Hold Valves with bolt and concrete anchor:
[ Ссылка ]
*Barry's Vids on the Valve Chest:*
✔ Reinstalling TCU and Spool Valves (and all the other valves too!):
[ Ссылка ]
✔ Doing the Adjustments on a Valve Chest:
[ Ссылка ]
✔ His Rate of Lowering Valve plunger was stuck, here's how he got it out:
[ Ссылка ]
✔ Initial strip down of his Valve Chest:
[ Ссылка ]
*D3Sshooters detailed video on how the Valve Chest works:*
[ Ссылка ]
Any other videos out there you've found useful? Comment below!
#hydraulics, #davidbrown, #tractorrepair
