C500 clark forklift11/21/2023 ![]() I got a new master cylinder, new wheel cylinders and piped the MC direct.eliminated the left-side functionality all together. So there is a shuttle valve - same thing as an "OR" element in fluid logic - that was apparently sticking or leaking. The function puts the trans in neutral and applies the brakes. I eliminated the functionality of the left pedal on mine. Parts were not true OEM but were like generic "auto parts" where they are built by a 3rd party supplier "to fit your make and model".no complaints about the parts - I think I used Nash Lift somewhere in Kentucky as I found them easy to deal with. A lot of messing around with gearwrenches and box ends to get all the fasteners loose, then a super heavy "final drive" assembly on each side which is spline-driven by the transmission. I changed the brakes on my avatar Clark - not that bad to do but a *lot* of bolts and I twisted off a 1/2" square drive breaker bar before I realized that 3/4" drive tools were necessary at least on the lug nuts. The transmission oil level should be checked with warm oil and the engine running.I would also look at the rod looks to me like a single stage mast, so right up at the top - if all is good you can rebuild the mast cylinder with a seal kit and some work - if the chroming is rusted badly at the top it could be eating the rod wiper which in turn eats the u-cup which in turn creates a leak. Clark originally specified Type A, Suffix A type transmission fluid, but this oil specification became obsolete in 1967, and was replaced by Dexron. The Hydratork transmission uses Dexron Automatic transmission fluid. ![]() The right pedal actuates the brakes only. Pressing down further on the inching pedal applies the brakes. Depressing the left inching pedal approximately 1-1/2 inches reduces oil pressure to the transmission clutch packs, effectively disengaging the transmission so you can rev the engine for faster hydraulic speeds. There are two brake-type pedals, the left one is the inching pedal, and the right one is the service brake pedal. Clark advise to not change speeds or direction whilst moving. You manually select the desired direction and speed selection, and you can do this without any need for a foot-operated clutch. It should have 2 column-mounted levers, one is Forward-Reverse lever, the other is a Hi and Lo Speed lever. So, if your C500 YS-80 doesn't have a clutch pedal, then it has a Hydratork powershift transmission, which is not a full automatic, unlike an auto. ![]() Now you say it doesn't have a clutch pedal. A manual transmission has a clutch pedal. However, their lines of early equipment are the stuff of legend and the C500 range must rate as the peak of American forklift engineering, for durability, quality and repairability. It's unfortunate that Clark, such a great company in its original form, has undergone about 30 corporate takeovers, mergers and other reshuffles, so that its amazing that Clark still even exist today in any form. I have no idea of the reproduction quality of the manuals from this site, I have never used their services.īe careful of the reproduction quality of any printed reproduction manuals being offered, there are some pretty poor copies on offer. The cheapest C500 YS-80 repair manual I could find was an electronic version for $49.95 from the site listed below. It appears you might have to purchase the C500 YS-80 repair manual to acquire the information you seek as regards type of oil and quantity. There are numerous "archived spec sheets" and earlier model information available for free download from the site below, under the "company" menu. Unfortunately, this operator manual does not appear to contain compartment quantity/refill figures. I can't lay my hand on the C500 YS-80 specs right at present, but I did find the operator manual for free from the site. The transmission, being a sliding gear countershaft transmission should take a gear oil, typically 85-90 wt gear oil. The C500 YS-80 had the option of the Hydratork automatic transmission or a manual countershaft transmission with a foot clutch, as in typical automotive design.
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