4-Hole Mechanical Diaphragm Fuel Supply Pump for Perkins Engines - Code 3801987

The 4-hole mechanical diaphragm fuel feed supply pump (part number 3801987) is a vital hydraulic component designed to deliver continuous diesel fuel delivery from the tank to the filtering and injection circuit on Perkins 903.27 and Perkins 3.152/1000 series engines. Engineered with a heavy-duty rectangular 4-bolt mounting flange (vertical pitch 25 mm, horizontal pitch 45 mm) and a drive lever reach of 27 mm from flange face to tip, it ensures precise camshaft engagement and vibration-free operation. Fully interchangeable with original OEM references 296265A1, 1300080739, 4222090M91, 3637292M91, ULPK0004, and 2641712, it is widely utilized across agricultural tractors, vineyard/orchard models, and crawlers by Case IH and Landini.

Key Features and Construction Advantages

• Heavy-Duty 4-Bolt Flange (25 x 45 mm): Ensures uniform clamping pressure across the engine block mating surface, preventing oil seepage and flange warping.
• Calibrated 27 mm Drive Lever: Precision-hardened mechanical arm engineered to track the camshaft eccentric with minimal friction and wear.
• Chemical-Resistant Diaphragm: High-grade elastomeric core formulated to withstand engine thermal cycles and modern agricultural diesel or biodiesel fuels.
• Direct OEM Interchangeability: Manufactured strictly to factory original tolerances for direct bolt-on installation on Case IH and Landini equipment.
• Dependable Fuel Priming: Prevents low-pressure system pressure drops and fuel line cavitation, ensuring quick cold-morning starts.

Technical Specifications & OEM Cross References

Machinery Application & Vehicle Compatibility

Manufacturer	Series / Range	Compatible Models
Case IH	Compact & CX Series	Compact: C 50, C 60; CX: CX 50, CX 60
Case IH	CS Series	CS 48 (2/97-1/01), CS 52 (1/01-3/04), CS 58 (2/97-1/01), CS 63 (1/01-3/04)
Landini	30 / 40 / 50 Series	30: 5830, 6030, 6830, 7830, 8830; 40: 5840, 6040, 6840; 50: 6550, 7550, 8550
Landini	60 / 70 / 80 Series	60: 5860, 6860, 7860, 8860, 9060; 70: 5870, 6070, 6870, 7870, 8870; 80: 7880, 9080
Landini	500 / 560 Series	500: 5500, 6500, 7500, 7505, 8500; 560: 6060
Landini	Advantage & Blizzard Series	Advantage: 60, 65, 75, 85, L95; Blizzard: 60, 65, 75, 85, 95
Landini	Crawler & CF Series (Cingolati)	C: C 4830, C 5830, C 6500, C 6830, C 7800, C 7830, C 8860; CF: CF 4830, CF 5030, CF 5830, CF 6030, CF 6060, CF 6830
Landini	Orchard Series (Frutteti)	4530, 5530, 5560, 6030, 6060, 6530, 6560, 7530, 7560, 8530, 8560
Landini	Globus, Mythos & Vision Series	Globus 55; Mythos 115; Vision 80, Vision 100
Landini	Landpower & Legend Series	Landpower: 125, 130, 135, 145, 160, 185; Legend: 105, 115, 125, 130, 135, 145, 160, 165, 185
Landini	Rex, Rex Cab & Foot Step Series	Rex: 60, 65, 75; Rex Cab: 60; Rex Foot Step: 60, 65
Landini	Trekker & Trekker C Series	Trekker 60; Trekker C 75, Trekker C 85, Trekker C 95
Landini	Vigneti & Vigneti Rex Cab Series	Vigneti Cab: 60, 65, 75; Vigneti Foot Step: 60, 65, 75; Vigneti Rex Cab: 60, 65

Installation Guidelines and Workshop Notes: Prior to mounting, inspect the camshaft drive lobe for scoring or excessive wear and thoroughly clean the mating face on the Perkins block. Always fit a new 4-hole mounting gasket to prevent engine oil leaks. Slide the operating lever smoothly underneath the camshaft eccentric; if noticeable spring resistance is met upon approach, turn the crankshaft by hand until the camshaft sits on its lowest lift circle. Fasten all four bolts gradually in a crosswise pattern to ensure flat, even gasket compression. Bleed trapped air from the low-pressure fuel circuit before cranking the engine.