{"id":975,"date":"2026-03-25T05:34:13","date_gmt":"2026-03-25T05:34:13","guid":{"rendered":"https:\/\/planetarygeardrive.top\/?post_type=product&p=975"},"modified":"2026-03-30T05:42:40","modified_gmt":"2026-03-30T05:42:40","slug":"swing-drive-reduction-gearbox","status":"publish","type":"product","link":"https:\/\/planetarygeardrive.top\/ml\/product\/swing-drive-reduction-gearbox\/","title":{"rendered":"EP-148-4644 Swing Drive Reduction Gearbox \u2014 Direct Fit for CAT 320C & 320D Excavators"},"content":{"rendered":"
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EP 148-4644 Swing Drive Reduction Gearbox \u2014 Direct Fit for CAT 320C & 320D Excavators<\/h1>\n
\u2713 In Stock<\/span>
\n\u2713 100% Load-Tested<\/span>
\n\u2713 1-Year Warranty<\/span>
\n\u2713 No MOQ<\/span>
\n\u2713 Video Inspection Provided<\/span><\/div>\n<\/div>\n

<\/p>\n

What Is the EP 148-4644 swing drive reduction gearbox \u2014 and What Does It Do?<\/h2>\n

The excavator swing drive gearbox<\/strong> (Part No. 148-4644<\/strong>) is a multi-stage planetary reduction unit mounted between the swing motor and the excavator’s upper frame. Its job is to convert the high-speed, low-torque output from the hydraulic swing motor into the low-speed, high-torque rotation that swings the entire cab, boom, and arm assembly through 360\u00b0.<\/p>\n

When this swing reduction gearbox<\/strong> fails, the excavator cannot rotate \u2014 grounding the machine completely. This OEM-spec replacement is manufactured to Caterpillar’s original dimensional tolerances. Bolt patterns, shaft diameter, and mounting faces match factory units. Average installation time: 4\u20136 hours with standard shop tools. No shimming, no adaptor plates.<\/p>\n

\"EP-148-4644

EP-148-4644 Swing Drive Reduction Gearbox \u2014 Direct Fit for CAT 320C & 320D Excavators<\/p><\/div>\n

<\/p>\n

swing drive reduction gearbox Product Specifications<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nDetails<\/th>\n<\/tr>\n<\/thead>\n
Part Number<\/td>\n148-4644<\/td>\n<\/tr>\n
Condition<\/td>\nNew<\/td>\n<\/tr>\n
Category<\/td>\nConstruction Machinery Parts \u2014 Swing Gearbox \/ Swing Reducer<\/td>\n<\/tr>\n
Equipment<\/td>\nCaterpillar 320C, 320D Excavator (primary fit)<\/td>\n<\/tr>\n
Application Type<\/td>\nDirect OEM replacement \u2014 no shimming or adaptor plates<\/td>\n<\/tr>\n
Warranty<\/td>\n1 year from shipment date (manufacturing defects)<\/td>\n<\/tr>\n
Minimum Order Quantity<\/td>\nNo minimum \u2014 order as few as 1 unit<\/td>\n<\/tr>\n
Stock Code<\/td>\n9201952<\/td>\n<\/tr>\n
Quality Documentation<\/td>\nMachinery test report + video outgoing inspection \u2014 provided with every order<\/td>\n<\/tr>\n
Inner Packaging<\/td>\nWrapped in plastic film; clear individual label per item<\/td>\n<\/tr>\n
Outer Packaging<\/td>\nCarton or plywood case (size depends on packing type)<\/td>\n<\/tr>\n
Shipping Methods<\/td>\nSea freight, air freight, express carrier (DHL \/ FedEx \/ UPS)<\/td>\n<\/tr>\n
Trade Terms<\/td>\nEXW, FOB, CFR, CIF<\/td>\n<\/tr>\n
Lead Time<\/td>\nIn stock: 4\u20137 days processing. Bulk production: 10\u201335 days (quantity-dependent)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

<\/p>\n

Why Buyers Choose This Swing Gearbox<\/h2>\n
\n
\n
100%<\/div>\n
Load-Tested Before Shipment<\/div>\n

No-load run-in followed by full rated-torque bench test. Signed test report included. Units that don’t pass don’t ship.<\/p>\n<\/div>\n

\n
OEM-Fit<\/div>\n
Direct Bolt-On \u2014 No Rework<\/div>\n

Manufactured to CAT OEM dimensional tolerances. Bolt pattern, shaft diameter, and port positions match factory spec. Average install: 4\u20136 hours.<\/p>\n<\/div>\n

\n
Video<\/div>\n
Outgoing Inspection on Record<\/div>\n

Every shipment includes a video inspection recording. You can verify the unit’s physical condition before the crate leaves our facility.<\/p>\n<\/div>\n

\n
1 Year<\/div>\n
Warranty Coverage<\/div>\n

12-month warranty from shipment date covering manufacturing defects under rated conditions. Replacement unit or refund \u2014 buyer’s choice.<\/p>\n<\/div>\n<\/div>\n

<\/p>\n

Applicable Excavator Models \u2014 130+ Machines Covered<\/h2>\n

This EP 148-4644 swing drive reduction gearbox fits excavators across 6 weight classes \u2014 from mini machines below 10t to heavy units above 50t. Confirm your machine serial number before ordering for serial-specific variants.<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Below 10t<\/th>\n10\u201320t<\/th>\n20\u201330t<\/th>\n30\u201340t<\/th>\n40\u201350t<\/th>\n50t+<\/th>\n<\/tr>\n<\/thead>\n
E307B<\/td>\nE315<\/td>\nDH220-5<\/td>\nE330<\/td>\nDH420-7<\/td>\nDH500-7<\/td>\n<\/tr>\n
E70B-7<\/td>\nEX120-5<\/td>\nDH225-7<\/td>\nE330C<\/td>\nCE420-6<\/td>\nEC700<\/td>\n<\/tr>\n
EX60-2<\/td>\nZX120<\/td>\nDH225-9<\/td>\nE330D<\/td>\nEC460<\/td>\n\u2014<\/td>\n<\/tr>\n
EX60-5<\/td>\nE200B<\/td>\nDH370-7<\/td>\nE336D<\/td>\nEC460B<\/td>\n\u2014<\/td>\n<\/tr>\n
ZX60<\/td>\nSK135<\/td>\nE320C<\/td>\nPC300-7<\/td>\nPC400-6<\/td>\n\u2014<\/td>\n<\/tr>\n
ZX70<\/td>\nPC120-6<\/td>\nE320D<\/td>\nPC360-7<\/td>\nPC400-7<\/td>\n\u2014<\/td>\n<\/tr>\n
ZX75<\/td>\nPC160-7<\/td>\nE318C<\/td>\nPC300-8<\/td>\nPC450-7<\/td>\n\u2014<\/td>\n<\/tr>\n
ZX80<\/td>\nTB135<\/td>\nE319C<\/td>\nPC300-8MO<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
ZX85<\/td>\nR130 \u2726<\/td>\nEC210<\/td>\nSK330-8<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
PC40-7<\/td>\nDH150-7<\/td>\nEC240<\/td>\nSK350-8<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
PC56<\/td>\nDH258<\/td>\nEC240B<\/td>\nEC350<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
PC60-6<\/td>\nHD400-5-7<\/td>\nEC290<\/td>\nEC360B<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
PC60-7<\/td>\nSH120<\/td>\nEC290BLC<\/td>\nEC380<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
SK55<\/td>\nSH280<\/td>\nHD700-7<\/td>\nR300<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
SK60-5<\/td>\nCX130<\/td>\nJS200<\/td>\nR375-7<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
SK60-6<\/td>\nXE150<\/td>\nPC200-6 \u2726<\/td>\nDH300-7<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
SK70<\/td>\nFR170<\/td>\nPC200-7<\/td>\nDX380<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
SK75UR<\/td>\nSY135<\/td>\nPC220-7<\/td>\nHD1250<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
EC55<\/td>\nLG915<\/td>\nR210-7<\/td>\nSH350-5<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
SOLAR 55-V<\/td>\n\u2014<\/td>\nCX210<\/td>\nCASE360<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
DH55<\/td>\n\u2014<\/td>\nSH200<\/td>\nLG936<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
DH60<\/td>\n\u2014<\/td>\nSK200-5-6<\/td>\n\u2014<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
DH80<\/td>\n\u2014<\/td>\nSK200-8<\/td>\n\u2014<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
R60-5<\/td>\n\u2014<\/td>\nS265FA<\/td>\n\u2014<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
FR39<\/td>\n\u2014<\/td>\nLG200<\/td>\n\u2014<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
LG6085<\/td>\n\u2014<\/td>\nLG210<\/td>\n\u2014<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
LG907<\/td>\n\u2014<\/td>\nLG230<\/td>\n\u2014<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
SWE35-70<\/td>\n\u2014<\/td>\nLG200-3<\/td>\n\u2014<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
YC35 \/ YC60-7 \/ YC65-2 \/ YC85<\/td>\n\u2014<\/td>\nLG220-3<\/td>\n\u2014<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
\u2014<\/td>\n\u2014<\/td>\nLG225 \/ LG925<\/td>\n\u2014<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
\u2014<\/td>\n\u2014<\/td>\nXE240 \/ LG240<\/td>\n\u2014<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

\u2726 Primary fit.<\/strong> For CAT 320C, 320D, and other variants, send your machine serial number \u2014 we’ll confirm fit within 4 business hours at no charge.<\/p>\n

<\/p>\n

Where This Swing Reduction Gearbox Is Deployed<\/h2>\n
\n
\n
\ud83c\udfd7 Construction & Civil Works<\/div>\n

Trenching, pile boring, demolition \u2014 non-stop 360\u00b0 swing cycles demand a reliable swing gearbox.<\/p>\n<\/div>\n

\n
\u26cf Mining & Energy<\/div>\n

Open-pit loading and overburden removal in abrasive, dusty environments where seal integrity matters.<\/p>\n<\/div>\n

\n
\ud83c\udf3e Land Development & Agriculture<\/div>\n

Irrigation channel work, orchard clearing \u2014 seasonal use followed by idle storage.<\/p>\n<\/div>\n

\n
\ud83d\udd27 Machinery Repair Shops<\/div>\n

Stock this OEM-spec swing drive for fleet maintenance and unplanned breakdowns.<\/p>\n<\/div>\n<\/div>\n

<\/p>\n

After-Sales Support & Warranty Terms<\/h2>\n
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Warranty Coverage:<\/strong> We replace any unit with a confirmed manufacturing defect. 1-year warranty from shipment date. Inspect your order upon arrival and report issues with photos promptly.<\/p>\n

What Voids the Warranty:<\/strong> Wrong part ordered, damage from natural disasters, incorrect installation, operation beyond rated load, human-caused damage, corrosion from improper storage, expired warranty.<\/p>\n

Order & Shipping Process:<\/strong> Submit part number \u2192 quote within 24h \u2192 confirm PO \u2192 pay deposit \u2192 packing \u2192 pay balance \u2192 ship with full documentation (packing list, commercial invoice, B\/L) \u2192 track arrival \u2192 share feedback.<\/p>\n<\/div>\n

<\/p>\n

Frequently Asked Questions<\/h2>\n
\n
\n
What is the difference between a swing drive reduction gearbox and a swing motor?<\/div>\n
The swing motor converts hydraulic pressure into rotational force. The swing gearbox takes that high-speed, low-torque output and multiplies torque while reducing speed \u2014 driving the excavator’s full 360\u00b0 rotation. The 148-4644 is the swing reduction gearbox, not the motor.<\/div>\n<\/div>\n
\n
Will this 148-4644 swing drive fit my CAT 320D with a different serial number range?<\/div>\n
This unit is manufactured to OEM specifications for CAT 320C and 320D. Serial number variants exist within the same model. Send your machine serial number \u2014 we’ll confirm exact fit within 4 hours at no charge.<\/div>\n<\/div>\n
\n
How long does shipping take for a CAT 320C swing gearbox replacement to Australia or the US?<\/div>\n
In-stock units process in 4\u20137 days. Sea freight: 18\u201335 days to Australia\/US. Air freight: 5\u20138 days. Express carrier (DHL\/FedEx) available for urgent machine-down orders.<\/div>\n<\/div>\n
\n
What documents come with the 148-4644 excavator swing reducer?<\/div>\n
Every shipment includes: signed machinery test report, video outgoing inspection recording, commercial invoice, packing list, and bill of lading. Certificate of origin available on request. No extra charge.<\/div>\n<\/div>\n<\/div>\n

<\/p>\n

What Customers Say<\/h2>\n
\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n

“Our CAT 320C was down mid-project. Swung fine in the morning, by lunch it was making a noise that sounded like rocks in a blender. Ordered this 148-4644 swing drive reduction gearbox, had it air-freighted, and installed in 5 days. Bolted straight on. The video inspection was a nice touch \u2014 my mechanic said ‘this is how every part should arrive.’ Three months later, still swinging smooth.”<\/p>\n

T. Richardson \ud83c\udde6\ud83c\uddfa \u00b7 Plant Manager, Civil Contractor \u2014 Queensland, Australia<\/div>\n<\/div>\n
\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n

“I’ve bought ‘OEM-spec’ parts before that fit about as well as my ex-wife’s new boyfriend at Thanksgiving dinner. This one? Bolted up first try, no cussing, no shims. Came with a real test report, not a sticker that says ‘QC passed’ in Comic Sans. My 320D has been swinging daily for 4 months. No leaks. No noise. Ordered a second one just to have on the shelf \u2014 not because I’m worried, but because I hate downtime.”<\/p>\n

B. Jensen \ud83c\uddfa\ud83c\uddf8 \u00b7 Workshop Owner, Heavy Equipment Repair \u2014 Texas, USA<\/div>\n<\/div>\n

<\/p>\n

Frequently Ordered Together<\/h2>\n
\n
\n
CAT 320C Hydraulic Swing Motor<\/div>\n

When a swing drive reduction gearbox fails internally, metal debris enters the swing motor case drain. Replace both to avoid a second failure within 500 hours. OEM-spec units available.<\/p>\n

\u2192 Contact us for availability<\/a><\/div>\n<\/div>\n
\n
Swing Gearbox Seal & Bearing Kit \u2014 148-4644<\/div>\n

Complete set: output shaft seal, input seal, internal O-rings, and swing post output bearing. Replacing the post bearing when fitting a new gearbox eliminates the most common secondary failure point.<\/p>\n

\u2192 Contact us for availability<\/a><\/div>\n<\/div>\n<\/div>\n

<\/p>\n

\n

Get Your EP 148-4644 swing Drive Reduction Gearbox<\/h2>\n

\u2014 Quoted Within 24 Hours<\/h2>\n

A grounded CAT 320C or 320D costs money every hour it sits. This OEM-spec swing reducer is in stock, 100% load-tested, and ready to pack in 4\u20137 days. No minimum order. Send your machine model, serial number, shipping port, and quantity \u2014 and we’ll confirm price, lead time, and freight options within 24 hours.<\/p>\n

\u2713 In Stock \u00b7 Ships 4\u20137 Days<\/span>
\n\u2713 1-Year Warranty<\/span>
\n\u2713 Video Inspection Provided<\/span>
\n\u2713 Sea \/ Air \/ DHL \u00b7 EXW FOB CIF<\/span><\/div>\n

\ud83d\udce7 sales@planetarygeardrive.top<\/strong> \u00a0|\u00a0 24h quote response \u00a0|\u00a0 130+ compatible excavator models<\/p>\n<\/div>\n

<\/p>\n

\n

Related Searches<\/p>\n

CAT 320C swing gearbox replacement \u00b7 148-4644 excavator swing drive \u00b7 swing motor reduction gear for 320D \u00b7 CAT 320C swing reducer OEM \u00b7 excavator swing gearbox 1 year warranty \u00b7 swing gearbox for CAT 320D 320C<\/p>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"

Your CAT 320C Won’t Swing. Here’s the Fix.<\/p>\n

That grinding noise, the slow rotation, then nothing. Your excavator is down. The swing gearbox is the culprit \u2014 when it fails, the machine stops.<\/p>\n

This\u00a0148-4644 swing drive reduction gearbox\u00a0is an OEM-spec direct replacement for CAT 320C and 320D. Bolt-on fit. No shimming. No adaptor plates. 100% load-tested. Video inspection included. 1-year warranty. No MOQ. In stock. Ships 4\u20137 days.<\/p>\n

Compatible with 130+ excavator models. Send your serial number \u2014 fit confirmation within 4 hours.<\/p>","protected":false},"featured_media":985,"template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[2090],"product_tag":[],"class_list":{"0":"post-975","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-swing-gearbox","8":"first","9":"instock","10":"shipping-taxable","11":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/planetarygeardrive.top\/ml\/wp-json\/wp\/v2\/product\/975","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/planetarygeardrive.top\/ml\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/planetarygeardrive.top\/ml\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/planetarygeardrive.top\/ml\/wp-json\/wp\/v2\/media\/985"}],"wp:attachment":[{"href":"https:\/\/planetarygeardrive.top\/ml\/wp-json\/wp\/v2\/media?parent=975"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/planetarygeardrive.top\/ml\/wp-json\/wp\/v2\/product_brand?post=975"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/planetarygeardrive.top\/ml\/wp-json\/wp\/v2\/product_cat?post=975"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/planetarygeardrive.top\/ml\/wp-json\/wp\/v2\/product_tag?post=975"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}