Hydraulic Hose Replacement
Replacing Italian hydraulic hoses can be challenging. All Euro tractors use banjo fittings, a fitting that resembles a banjo body with a bolt through the middle. Unfortunately, banjo fittings are not common to North America and often hydraulic shops either shrug their shoulders or laugh when you bring them in. Some tractor owners have gone to the expense of retrofitting tractors with North American hoses, but it results in a jumble of adapters. We can now provide replacement hoses for your tractor and loader.
Ordering hose by tractor make and model isn't possible. We need to know the hose size, the "eye" diameter of the banjo ends and hose length (eye to eye). This is because over the years manufactures changed hosing. As an example, Pasquali steering valves have four banjo's that can either be 3/8" or 1/2" depending on the distribution block used. These are inch fittings in British Standard Parallel (BSPP) measurement. BSPP is used throughout Europe and vary in size by application. We have seen identical tractors of the same era with different size fittings, so it doesn't appear there was a standard we can go by. We also carry replacement banjo bolts, compression seals and adapters. Most Euro hoses are either 1/4 or 3/8" nominal size. Measure hose length between the centers of the banjo fittings. Also note the orientation of the fittings to each other for optimum hose lay (do not twist or torment hose to fit, use full curves, ends should be crimped to optimum lay).
Always avoid sharp or hard bends, lack of adequate arc or poor layout due to using the wrong ends. Note above where using two 90's on conventional hoses avoids messy layouts. One of the beauties of the banjo fitting is that it allows for 360 degree adjustment on a flat plane. As long as there is some thought as to end orientation to each other, hoses can adjusted to optimum lays.
Some owners don't like working with banjo's, so we can provide you with JIC adapters and hoses. We personally like the banjo fittings and with the new design neo-alum seal rings, they are essentially leak proof. Almost every excavator in the world now uses banjo fittings, so they are not out-dated or an inferior design.
PASQUALI TRACTOR HYDRAULICS
If you are working on or trying to troubleshoot an older Pasquali hydraulic system please refer to the service manual. Note: When installing a loader, it's preferred to follow the 3pt lift valve with the loader valve to give priority to the power steering. If manual steer, the loader valve could be located on the inlet side of the 3pt valve. Regardless of installation, always keep low pressure circuits separate from high pressure circuits, they cannot be tied to each other. While many loader valves are installed first in sequence and work fine, it can cause the power steering to cut out at times when using the loader.
Hydraulic implements like loaders used a number of generic cylinders necessitating disassembling of the cylinder to match the seals. Many implements were not built by the tractor manufacturer, but outsourced. This makes it challenging to know what you have. Hydraulic seals, o-rings and wipers should be sourced through your local hydraulic specialists. They will often have the ability to source what you need at better prices than what we can offer. If unavailable, let us know.
PLEASE NOTE: Many people do not understand how dangerous hydraulic oil is under pressure. Never try to locate a leaking hose by sliding your hand up and down the hose when the system is under pressure. The velocity with which hydraulic oil is forced through a small rupture can be in excess of hundreds of feet per second. While not common, an undetected pinhole leak in a hydraulic hose will act like a hypodermic needle, injecting oil directly into your hand. Injections may feel like a pin prick and may not look damaging, but can have life-threatening results if left untreated. When hydraulic fluid enters the body, it begins to kill tissue. If this happens: Seek immediate medical attention. Do not take this warning lightly!
The original pumps used on most Italian tractors were made by Hydroderma or Saprisa and are no longer available. We offer direct pump replacements but note the following before ordering:
All pumps are either CW or CCW rotation, which is always determined by shaft rotation when looking directly at the shaft. So a Ruggerini engine turning clockwise (facing the front of the engine) and driving a hydraulic pump directly off the front pulley requires a CCW pump. Remember you determine the type of pump by the rotation of the shaft when looking directly at the shaft (direct drive pumps will be opposite rotation of the pulley or shaft driving it). Lombardini engines have multiple mountings and the pump type will be determined by what drives it. In many cases they require a CW rotation but direct drive pumps are often CCW.
Regardless of pump type, you need to determine the inlet and outlet sides of the pump before installation as the replacement pump may be reversed. If the pump has different size ports, normally the larger will be the inlet. You can confirm this using the same test if the ports are the same size. Turn the pump shaft in the correct direction while looking directly into what you think is the inlet. If the gear teeth are both turning up and away from the center, that is the inlet. If the gear teeth are turning downward towards each other, that is the outlet. While counter intuitive, the gear movement captures the oil and moves it around the outside of the gears. It does not suction oil directly through the middle of the gears. Once determined, ensure hoses are attached correctly.
Original valves are normally no longer available. That should not discourage you though as hydraulic valves are interchangeable. The original valve was a bit unique, but we have single acting spool valves that swap out with minimum modifications. You can (in almost all cases) use your original hoses and do not require adapters.
There is both good and bad news about leaking hydraulic cylinders. The good news is they are easily fixed, the bad news is that some of the seals are difficult to find. We no longer carry all seals because we can't be competitive on cost. Normally if the cylinder seal is leaking, it means there is probably enough wear to warrant rebuilding the cylinder. This is not beyond the capabilities of the average tractor owner, but there are a few simple tricks you need to know. Specialized tools are not really necessary, although a pin wrench is nice to have.
The Pasquali lift cylinders on the 986 - 997 models use a somewhat unusual piston seal pictured at the middle right. This is a two part seal consisting of a nylon bearing ring with neoprene seal insert. These seals are not common to North America, so many hydraulic houses improvise by using spacers and large O-rings. While it certainly works for a while, customers notice a reduction in lift strength and a tendency for leakage at the back of the cylinder. We stock high quality European seals to overhaul your cylinder and recommend using the original style seals for maximum performance.
The picture below shows a rod seal and wiper from a Pasquali lift cylinder.
If your tractor has a loader, please contact your local hydraulic shop to help you with replacement seals. Once opened, they should be able to match them and help you out,