O
oak
- Messages
- 22
Hi.
My '07 T5 California has an issue with the elevating roof. Symptoms are that the roof opens fine, but when lowering it only lowers one side. Concluded the problem is with the hydraulic pump unit since when I swapped ram hoses between left and right on the pump side, the symptom moved to the other ram.
Since the pump itself is generating hydraulic flow, it appears that something is wrong with either a canal, restrictor, or some kind of flow balancing mechanism. Given that there are few moving parts, I find it unlikely that anything is actually physically damaged or worn. I reckon it is a fair chance that something is either stuck or clogged due to contamination. Given that the price for a new pump is hideous, I decided to try a partial disassembly and then try to rinse the housing.
Status is that I have disassembled all the parts that can easily be disassembled (some springs/balls and a couple of sliding pistons). Left in the block are some pressed in sleeves, and what looks like calibrated adjustment valves. I have not touched anything of this.
I think I will try to submerge everything in a fluid in an ultrasonic cleaner. That should hopefully loosen any trapped contamination. Then rinse/flush somehow afterward. The question I have is what kind of fluid can be used? Since some parts are left in the block It is difficult to ensure all cleaning fluid is properly flushed out. Ideally, it should be compatible with the hydraulic fluid (which is 150GBP per liter by the way).
Any suggestions?
My '07 T5 California has an issue with the elevating roof. Symptoms are that the roof opens fine, but when lowering it only lowers one side. Concluded the problem is with the hydraulic pump unit since when I swapped ram hoses between left and right on the pump side, the symptom moved to the other ram.
Since the pump itself is generating hydraulic flow, it appears that something is wrong with either a canal, restrictor, or some kind of flow balancing mechanism. Given that there are few moving parts, I find it unlikely that anything is actually physically damaged or worn. I reckon it is a fair chance that something is either stuck or clogged due to contamination. Given that the price for a new pump is hideous, I decided to try a partial disassembly and then try to rinse the housing.
Status is that I have disassembled all the parts that can easily be disassembled (some springs/balls and a couple of sliding pistons). Left in the block are some pressed in sleeves, and what looks like calibrated adjustment valves. I have not touched anything of this.
I think I will try to submerge everything in a fluid in an ultrasonic cleaner. That should hopefully loosen any trapped contamination. Then rinse/flush somehow afterward. The question I have is what kind of fluid can be used? Since some parts are left in the block It is difficult to ensure all cleaning fluid is properly flushed out. Ideally, it should be compatible with the hydraulic fluid (which is 150GBP per liter by the way).
Any suggestions?