141-1977 CAT R1700 / R1700G Lift Cylinder Rod Assembly Aftermarket Replacement

Product Overview

SEIGO’s aftermarket hydraulic rod assembly, part number 141-1977, is a direct OEM-dimension replacement for the lift cylinder piston rod on the Caterpillar R1700 / R1700G underground Load Haul Dump (LHD) loader. Caterpillar catalogues this part as a Hydraulic Rod Assembly — the chrome-plated piston rod complete with its eye bearing — and it belongs to the R1700 lift cylinder group (141-1974). The rod runs at 101.6 mm (4 in) diameter.

This is a sub-component, not a complete cylinder. It is the single most commonly replaced part when a lift cylinder is rebuilt rather than replaced outright. On an underground LHD loader working in wet, abrasive rock conditions, the piston rod is the first surface to fail: rock dust and mine water attack the chrome plating, scoring and pitting develop, and the damaged rod surface then destroys the rod seal. In the majority of lift cylinder rebuilds, the barrel is still serviceable and only the rod and seal kit need replacing — which is why SEIGO supplies the rod as an individual item.

As a hydraulic cylinder manufacturer rather than a trading company, SEIGO produces the rod in-house: a 42CrMo4 bar, induction hardened to HRC 58–62, hard chrome plated to 25–30 µm, ground and polished to the OEM surface finish, with the rod eye machined and the eye bearing fitted to the original dimensions. This is exactly the failure surface the underground environment attacks, so rod chrome adhesion and plating quality are the whole point of this part. For a workshop rebuilding an R1700 lift cylinder in-house, the rod plus a seal kit typically costs 40–60% of a complete replacement cylinder, with far lower freight.

SEIGO also supplies the complete lift cylinder, the honed barrel, the cylinder head and the seal kit for this position, as well as the R1700 tilt, hoist and steering cylinders. Standard lead time is approximately 30 days ex-works, with expedited production available for mine-site downtime, and every rod is backed by a 12-month or 2,000 operating-hour warranty. Send us your machine serial number to confirm the exact lift cylinder your rod belongs to before ordering.

Product Specifications

* OEM part numbers, brand names and model designations are used for identification and cross-reference purposes only. SEIGO Machinery is an independent aftermarket manufacturer and is not affiliated with Caterpillar Inc.

Cat R1700 / R1700G Lift Cylinder & Rod Reference

141-1977 is the rod assembly for the R1700 / R1700G lift cylinder. The related complete cylinders and the components SEIGO supplies for this position are listed below.

The rod diameter across the R1700 / R1700G lift cylinder group is 101.6 mm. Because different serial ranges and generations use different complete-cylinder numbers, confirm your machine serial number so we can verify the correct rod length and eye configuration before manufacturing. SEIGO supplies the rod alone, the complete cylinder, the honed barrel and the seal kit for this position.

R1700 Lift Cylinder — Components Supplied Individually

SEIGO is a manufacturer, not a trading company. For the R1700 / R1700G lift cylinder we supply not only the complete assembly but each individual component — so a workshop can rebuild rather than replace, at a fraction of the cost and freight.

Rebuild vs replace: on an R1700 lift cylinder, the piston rod is the surface the underground environment attacks first. In most cases the barrel survives several rod service cycles, so replacing the rod (141-1977) plus a seal kit restores the cylinder at 40–60% of the cost of a complete replacement, with far lower freight. Send us your machine serial number and we will confirm the correct rod, seal kit or complete cylinder for your machine.

Why This Rod, Specifically

• We manufacture rods — this is our core product. SEIGO is a hydraulic cylinder factory with in-house boring, honing and hard chrome plating. The piston rod is not something we buy in and resell; it is what we make. For a rod-only order, that means the part you receive is built to the same specification as the rod in our complete cylinders.
• Built for the surface that fails. The rod is the exact surface the underground LHD environment attacks — rock dust and mine water pit and score the chrome. We plate to 25–30 µm hard chrome over a 42CrMo4 core induction-hardened to HRC 58–62, then grind and polish to the OEM finish, because plating adhesion and surface quality are the whole service life of this part.
• Rebuild economics. If your barrel is still good, replacing the rod (141-1977) and seal kit restores the cylinder at 40–60% of complete-cylinder cost. And a bare rod ships at a fraction of the freight of a complete cylinder — a real saving on parts going to remote mine sites.
• Correct rod, verified. The R1700 / R1700G lift cylinder group uses a 101.6 mm rod, but rod length and eye configuration vary by serial range and generation. We confirm the exact rod against your machine serial number before manufacturing, so it drops straight into your barrel.
• Whole cylinder from one source. If the barrel is also beyond service limit, we supply the honed tube, head, seal kit or the complete cylinder (141-1974) — all from the same factory, all to the same spec, on one order.
• Full inspection. ISO 9001:2015 manufacturing, with dimensional, hardness and straightness inspection on every rod, and a material certificate on request.

FAQ

Q1: Is 141-1977 a complete cylinder or just the rod?

A: 141-1977 is the rod assembly only — the chrome-plated piston rod with its eye bearing, as catalogued by Caterpillar as a Hydraulic Rod Assembly. It is not a complete cylinder. It is the rod for the R1700 / R1700G lift cylinder (the 141-1974 group). If you need the complete cylinder, that is 141-1974; if you are rebuilding and only need the rod, 141-1977 is the correct part.

Q2: Which cylinder does this rod belong to?

A: It is the piston rod for the R1700 / R1700G loader lift cylinder, part number 141-1974, which has a 215.9 mm bore, a 101.6 mm rod and a 560 mm stroke. Because the R1700 family uses different complete-cylinder numbers across serial ranges and generations, confirm your machine serial number so we can verify the correct rod length and eye configuration before manufacturing.

Q3: Why would I buy just the rod instead of a whole cylinder?

A: On an underground LHD loader, the piston rod is the first part to fail — rock dust and mine water score and pit the chrome, and the damaged rod then destroys the seal. In most cases the barrel is still serviceable. Replacing the rod (141-1977) and a seal kit restores the cylinder at 40–60% of the cost of a complete replacement, and a bare rod costs far less to freight to a remote mine site. For workshops with in-house assembly capability, rod-plus-seal-kit is the standard rebuild path.

Q4: What is the rod made of and how is it finished?

A: A 42CrMo4 core, induction hardened to HRC 58–62, hard chrome plated to 25–30 µm, then ground and polished to the OEM surface finish, with the rod eye machined and the eye bearing fitted to original dimensions. This is the specification that resists the chrome scoring and pitting caused by the abrasive, wet underground environment.

Q5: Can you also supply the barrel, seal kit or complete cylinder?

A: Yes. SEIGO manufactures the complete R1700 / R1700G lift cylinder (141-1974), the honed barrel, the cylinder head and the seal kit, as well as the R1700 tilt, hoist (541-8382) and steering cylinders. Whether you are rebuilding with a single component or replacing the whole cylinder, we supply it from one factory on one order. Send us your machine serial number and what you need.

Q6: What is the lead time and how does the rod ship?

A: Standard production lead time is approximately 30 days ex-works Guangdong, China, with expedited production available for mine-site downtime. A bare rod ships in protected tube packaging or a light export crate at much lower freight than a complete cylinder, FOB Shenzhen, CIF or DDP.

SEIGO Machinery is an independent aftermarket manufacturer. All OEM part numbers, brand names and machine model designations are used for identification and cross-reference purposes only. These aftermarket components are not manufactured by, endorsed by, or affiliated with Caterpillar Inc.