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Knocking and white smoke are indicators of water getting into a cylinder. Run it without the valve cover like Wolfman suggests. After that, a look under the head might be in order. Taking off the head is a reasonably easy job and it will let you see the condition of the gasket, valves, &...

When Tooljunkie mentioned a one-gallon difference in the dipstick marks I was sure we were talking about the hydraulic dipstick, not the engine dipstick. I shouldn't have assumed that. Luckily adding a small amount of 15w40 to the hydraulic reservoir will not hurt a L3750. Anybody new to...

The L3 chassis (L3350. L3750, L4150, L4350, L4850, L5450) has a very wide range of acceptable transmission hydraulic oil level. If it's above the first mark it has enough to work all day in summer heat without exceeding the design temp for the oil in the reservoir. Kub is pretty conservative...

When my HST was acting up I got the WSM hoping it would light the way. But while it was some help, it lines up with Kub's policy of replacing the whole HST unit if it doesn't perform properly. The manual describes HST operation, but the coverage is only skin-deep. Attached are L48 WSM pages...

Cold intake and exhaust valve clearance should be .0071"/.0087"(0.18/0.22mm)

When working right, the HST's regulator helps keep the pedal in position with minimal operator effort. With your foot off the pedal, a spring-loaded 2-way external damper lightly pushes the linkage returning it to neutral. Does yours fail to return from just one direction of travel ? or...

Here's another indication that the picture on the left in the original post is the HST motor. Googling hydrostatic slipper images brings up several examples - some with simple plain-face and some with a labyrinth in the surface like those in the right-hand pic in the original post. This...

Paul, you have been clear and you have the terminology right - the injection pump has three outlet fittings located on top. The individual injectors are at the other ends of the pipes at 3 locations on the cylinder head. Sounds like there's an issue with the injection pump not pushing fuel...

I was under the impression that slippers were smooth on both pump and motor - the grooved-face ones in your right picture were new to me. When I took apart my first automatic transmission I put a wire through part stacks to aid reassembly. Of course if the last guy put it together wrong that...

Pretty sure your left picture is the motor. The attached pictures are from a parts recycler - the tag has part number TA240-58600, the motor for Lxx10 and L48 HST's.

The first symptoms sounded like the swing cylinder's piston had come loose inside - but they don't fix themselves. Or the piston seal got a chunk of something in it - but that's not likely to clear up by itself either. Any chance the hoe was caught on the stabilizer? Pinched hose? Is it...

I'd look at the copper contacts inside the end of the solenoid these fit . They get burned away with age to where they don't conduct enough amps. The starting issue and the unexplained stopping may not be related.

Back in Post #6 of this thread, olthumpa posted a link to a discussion of a similar situation. Having read all 15 pages of olthumpa's clutch saga it sounds like your clutch has the same symptoms. On his new dual clutch the three links (rod releases) that connect the two stages together were...

Edit 9-2-15 SEE POST #14 BELOW

A quick test - short the positive terminal on the starter directly to the solenoid terminal (be careful, tractor brake set, out of gear, pto in neutral etc etc.) If the starter turns ok there's an open circuit somewhere - usually corroded plug-ins, blown or corroded fuse. (On older rigs the...

The fusible link (part number 38430-34530 light green) is intended to protect the instruments etc. if a battery is connected backward. It costs about $6 at the dealer or several online places list it. Usually located directly above the starter, it's a plug with a short loop of fat wire. Take...

Sounds exactly like my L3250 - which has the 1.9L liter version of the 1.7 in your rig. Nothing sounds unusual to me. These older engines were a little louder than the newer ones - no worries. Dick B

The original loader valve has 7 hoses - one being a "power-beyond" hose that goes back to the hydraulic block to power the 3-pt hitch. Some loader valves don't have a PB port. Some have it but need a special fitting put in to enable it. If there's a "PB" port on your new valve, run a hose...

Need to clean all 4 iron faces really well - the original factory sealant is very tough and hard to get rid of. I've had good results with a wire cup wheel on my grinder.

Steve - on the L48 the rear connectors and selector on the right side are for the backhoe swing circuit. It's a handy independent circuit for powering things like a splitter (or a grapple in my case). The other backhoe functions (and 3-point hitch) get flow from a second pump which has...