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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: • Case 885 Removing Hydraulic Control Valve 4 Barry's Vids on the Valve Chest: ✔ Reinstalling TCU and Spool Valves (and all the other valves too!): • David Brown 990 hydraulic valve chest rebu... ✔ Doing the Adjustments on a Valve Chest: • How to set up the hydraulic valve chest of... ✔ His Rate of Lowering Valve plunger was stuck, here's how he got it out: • How to remove a siezed spool from a David ... ✔ Initial strip down of his Valve Chest: • David Brown 990 valve chest strip down #24 D3Sshooters detailed video on how the Valve Chest works: • David Brown, Part 2 - Deep dive into hydra... Any other videos out there you've found useful? Comment below! #hydraulics, #davidbrown, #tractorrepair